diagnose sniffer packet fortigate cli command

Packet capture is displayed on the CLI, which you may be able to save to a file for later analysis, depending on your CLI client. Surround the filter string in quotes ('). To minimize the performance impact on your FortiManager unit, use packet capture only during periods of minimal traffic, with a serial console CLI connection rather than a Telnet or SSH CLI connection, and be sure to stop the command when you are finished.# diag sniffer packet port1 'host 192.168..2 or host 192.168..1 and tcp port 80' 1 The following example captures three packets of traffic from any port number or protocol and between any source and destination (a filter of. Delete the first and last lines, which look like this: Convert the plain text file to a format recognizable by your network protocol analyzer application. It is usually preferable to analyze the output by loading it into in a network protocol analyzer application such as Wireshark (http://www.wireshark.org/). For example, to display UDP port 1812 traffic between 1.example.com and either 2.example.com or 3.example.com, you would enter: 'udp and port 1812 and src host 1.example.com and dst \(2.example.com or 2.example.com \)'. Type one of the following integers indicating the depth of packet headers and payloads to capture: For troubleshooting purposes, Fortinet Technical Support may request the most verbose level (. In my lab, I have a lot of ICMP traffic so I will filter it further and only choose to capture packets destined to 3.210.115.14 (fortinet.com), diag sniffer packet any "host 3.210.115.14 and icmp" 4 l 0. FortiGate / FortiOS; FortiGate 5000; FortiGate 6000; FortiGate 7000; FortiProxy; NOC & SOC Management Use this feature to capture non-IP based packets. To do a sniff, follow the syntax below: # diagnose sniffer packet <interface> <'filter'> <level> <count> <tsformat>. To minimize the performance impact on your FortiAnalyzer unit, use packet capture only during periods of minimal traffic, with a serial console CLI connection rather than a Telnet or SSH CLI connection, and be sure to stop the command when you are finished. dia sniff packet any "(src 10.1.105.3 or src 10.1.105.1) and icmp" 4 l 0, This will give you any ICMP packet that is sourced from 10.1.105.3or sourced from 10.1.105.1, So this is probably one of my most used filters. If you are familiar with the TCP protocol, you may notice that the packets are from the middle of a TCP connection. To enter a range, use a dash without spaces. 192.168.0.2.3625 -> 192.168.0.1.80: syn 2057246590, 192.168.0.1.80 -> 192.168.0.2.3625: syn 3291168205 ack 2057246591, 192.168.0.2.3625 -> 192.168.0.1.80: ack 3291168206, 192.168.0.2.3625 -> 192.168.0.1.80: psh 2057246591 ack 3291168206, 192.168.0.1.80 -> 192.168.0.2.3625: ack 2057247265, Using the FortiOS built-in packet sniffer. If you do not specify a number, the command will continue to capture packets until you press Ctrl+C. SSH. In this example the test unit is continuously pinging 8.8.8.8. For this we can use the ! This is much easier to troubleshoot because we do not need to collect unnecessary packets. To enter a range, use a dash without spaces, for example 88-90. To display only the traffic between two hosts, specify the IP addresses of both hosts. Commands that you would type are highlighted in bold; responses from the Fortinet unit are not in bold. Examples of non-IP packets include IPsec, IGMP, ARP, and ICMP. For example, 172.16.1.5-172.16.1.15, or enter a subnet. 2) Save this fgt2eth.exe on a specific folder. For FortiGates with NP2, NP4, or NP6 interfaces that are offloading traffic, disable offloading on these interfaces before you perform a trace or it will change the sniffer trace. The sniffer then confirms that five packets were seen by that network interface. Does not display all fields of the IP header; it omits: 2 All of the output from 1, plus the packet payload in both hexadecimal and ASCII. Similar to mathematics, there is an order of operation. Bang), dia sniffer packet any 'host 10.1.105.3 and !port 22' 4 l 0, This would capture any packet from host 10.1.105.3 except for port 22 A.K.A. The fgt2eth.pl script is provided as-is, without any implied warranty or technical support, and requires that you first install a Perl module compatible with your operating system. Separate multiple VLANs with commas. FortiADC-VM # diagnose sniffer packet port1 none 1 3, 0.000000 172.30.144.20.53800 -> 172.30.144.100.22: ack 202368347, 0.000000 172.30.144.100.22 -> 172.30.144.20.53800: psh 202368415 ack 2508304372, 0.000000 172.30.144.100.22 -> 172.30.144.20.53800: psh 202368531 ack 2508304372. The sniffer then confirms that five packets were seen by that network interface. What to look for in the information the sniffer reads. Technical Tip: Packet capture (sniffer) This article describes the built-in sniffer tool that can be used to find out the traffic traversing through different interfaces. For additional information on the packet sniffer utility, see the Fortinet Knowledge Base article Using the FortiOS built-in packet sniffer. As a result, the packet capture continues until the administrator presses Ctrl+C. Packet capture can be very resource intensive. Before you start sniffing packets, you should prepare to capture the output to a file. Copyright 2018 Fortinet, Inc. All Rights Reserved. Use PuTTY to connect to the Fortinet appliance using either a local serial console, SSH, or Telnet connection. With the keyword srcwe are now saying that ONLY packets that are ICMP and are Sourced from 10.1.105.3 will be captured. Head_Office_620b # diagnose sniffer packet port1 none 1 3, 0.545306 172.20.120.17.52989 -> 172.20.120.141.443: psh 3177924955 ack 1854307757, 0.545963 172.20.120.141.443 -> 172.20.120.17.52989: psh 1854307757 ack 3177925808, 0.562409 172.20.120.17.52988 -> 172.20.120.141.443: psh 4225311614 ack 3314279933. Use this command to perform a packet trace on one or more network interfaces. Packet capture output appears on your CLI display until you stop it by pressing Ctrl+C, or until it reaches the number of packets that you have specified to capture. Note: It will ONLY show the outbound traffic since you specified srcand once it gets source NATd, it will no longer match the filter. In the above example, I am looking for ONLY ICMP traffic. This tool provides you with extensive analytics and the full contents of the packets that were captured. Another thing you can do is combine multiple hostcommands with anand, diag sniffer packet any "host 3.210.115.14 and host 10.1.105.3 and icmp" 4 l 0. The capture uses a high level of verbosity (indicated by3). So as an example, If I am pinging 3.210.115.14from 10.1.105.3but then from 10.1.105.3I start to ping 4.2.2.2that will also be picked up since I am capturing any ICMP from or to any of those two hosts. Hover over the symbol to reveal explanatory text. but do not press Enter yet. To start, stop, or resume packet capture, use the symbols on the screen. Once they get the information, I usually do not hear from them again and things just start working. Packet Capture. The following sniffer CLI command includes the ARP protocol in the filter which may be useful to troubleshoot a failure in the ARP resolution (for instance PC2 may be down and not responding to the FortiGate ARP requests). Below is a sample output. Open the converted file in your network protocol analyzer application. To display only the traffic between two hosts, specify the IP addresses of both hosts. FortiADC appliances have a built-in sniffer. # diagnose sniffer packet any "(ether[6:4]=0x00090f89) and (ether[10:2]=0x10ea)" . FortiADC# diagnose sniffer packet port1 'host 192.168.0.2 or host 192.168.0.1 and tcp port 80' 1. Lets try the same with the dstpacket and we will use 8.8.8.8since no one in my house uses Google for DNS. Type the packet capture command, such as: In the upper left corner of the window, click the PuTTY icon to open its drop-down menu, then select. Separate multiple ports with commas. dia sniffer packet any "tcp[13] = 18". The following example captures all TCP port 443 (typically HTTPS) traffic occurring through port1, regardless of its source or destination IP address. . dia sniffer packet any "tcp[13] & 4 != 0", Here is an example of capturing packets that match the SYN (SYNchronization) These lines are a PuTTY timestamp and a command prompt, which are not part of the packet capture. <count> <----- The number of packets to capture. Packet capture, also known as sniffing or packet analysis, records some or all of the packets seen by a network interface (that is, the network interface is used in promiscuous mode). Example of network as a filter: First filter: Sniff from two networks. Packet capture output is printed to your CLI display until you stop it by pressing CTRL+C, or until it reaches the number of packets that you have specified to capture. Part of successfully troubleshooting is learning packet capture. When you are running a capture and are not seeing what you are expecting to see, you may need to disable the offloading on that particular policy. We can use the ( )parentheses to combine and then use the AND to combine them. # diagnose sniffer packet any 'net 1.1.1.0/24 and net 2.2.2.0/24' 4 0 l. FortiADC # diagnose sniffer packet port1 'host 192.168..2 or host 192.168..1 and tcp port 80' 1. Type the number of packets to capture before stopping. Surround the filter string in quotes. diag sniffer packet any "src 10.1.105.3 and icmp" 4 l 0. So you see the packet coming in with a 10.1.105.3 IP address which is what DHCP gave my MacBook Pro. Press Enter to send the CLI command to the FortiMail unit, beginning packet capture. FGT# diagnose sniffer packet any "host <PC1> or host <PC2> or arp" 4 . Usually they are quick easy commands to make your day brighter and help you finish up quicker so you can enjoy family, friends, and libations. To display only forward or only reply packets, indicate which host is the source, and which is the destination. GitHub Gist: instantly share code, notes, and snippets. The capture uses a low level of verbosity (indicated by 1). Usefull Fortigate CLI commands. You can halt the capturing before this number is reached. =~=~=~=~=~=~=~=~=~=~=~= PuTTY log 2018-03-08.07.25 11:34:40 =~=~=~=~=~=~=~=~=~=~=~=. Type the packet capture command, such as: diagnose sniffer packet port1 'tcp port 541' 3 100 . As a result, output shown below is truncated after only one packet. 1) Download the fgt2eth.exe (For Windows Users) . At this verbosity level, you can see the source IP and port, the destination IP and port, action (such as ack), and sequence numbers. The number of packets the sniffer reads before stopping. Use PuTTY to connect to the Fortinet appliance using either a local serial console, SSH, or Telnet connection. As you can see the options are enableor disable, The other option is to go through the GUI and choose the Policy you want to disable offload on. When you are SSHd to the Fortigate which I usually am when running these commands, you CAN be overwhelmed by the very connection you are using. Type one of the following numbers indicating the depth of packet headers and payloads to capture: For troubleshooting purposes, Fortinet Technical Support may request the most verbose level (3). Sniff is a useful command when debugging routing problems. diagnose sniffer packet - this is the base command interface - You can either choose the interface specifically or use the keyword any options - here you can filter the capture by IP, protocol . The protocols in the list are all IP based except for ICMP (ping). We described the limitations on the previous section. diagnose sniffer packet <interface> "<options>" <verbosity level> <count> <timestamp format>. I have been in the networking and security industry for about 29 years as of this writing and I have always lived my a strict motto; and anyone that has worked with me in the past knows this well. If you do not specify a number, the command will continue to capture packets until you press Control +C. The following example captures the first three packets worth of traffic, of any port number or protocol and between any source and destination (a filter of none), that passes through the network interface named port1. The following example captures three packets of traffic from any port number or protocol and between any source and destination (a filter of none), which passes through the network interface named port1. Packet capture can be very resource intensive. Resources. You can also see the filter status and the number of packets captured. This number cannot be zero. FortiAnalyzer# diag sniffer packet port1 none 1 3, 0.918957 192.168.0.1.36701 -> 192.168.0.2.22: ack 2598697710, 0.919024 192.168.0.2.22 -> 192.168.0.1.36701: psh 2598697710 ack 2587945850, 0.919061 192.168.0.2.22 -> 192.168.0.1.36701: psh 2598697826 ack 2587945850. Enter the IP address of one or more hosts. Because the filter does not specify either host as the source or destination in the IP header (src or dst), the sniffer captures both forward and reply traffic. Packet capture, also known as sniffing or packet analysis, records some or all of the packets seen by a network interface (that is, the network interface is used in promiscuous mode). Packet capture, also known as sniffing, records some or all of the packets seen by a network interface. A specific number of packets to capture is not specified. diagnose: diagnose sniffer packet Use this command to perform a packet trace on one or more network interfaces. To stop the sniffer, type CTRL+C. 3 All of the output from 2, plus the the link layer (Ethernet) header. You can convert the plain text file to a format (.pcap) recognizable by Wireshark using the fgt2eth.pl Perl script. The second example shows 2which corresponds to Swhich is the SYN flag. Now in this output, you will see the that we are seeing the inand the outsince the destination IP stays the same preand postNAT. The following command is used to trace packets. Once the packet sniffing count is reached, you can end the session and analyze the output in the file. Use this command to perform a packet trace on one or more network interfaces. To enter a range, use a dash without spaces. You can also see pre and post NAT (Network Address Translation). Quick-Tips are short how tos to help you out in day-to-day activities. execute command like tcpdump # diagnose sniffer packet port15 Interface Port15 # diagnose sniffer packet any 'host xx.xx.xx.xx' # diagnose sniffer packet port15 'host xx.xx.xx.xx' # diagnose sniffer packet any 'host xx.xx.xx.xx or host yy.yy.yy.yy' # diagnose sniffer packet any 'udp port 53 or tcp port 53' # diagnose sniffer packet any . By recording packets, you can trace connection states to the exact point at which they fail, which may help you to diagnose some types of problems that are otherwise difficult to detect. The following commands will report packets on any interface that are traveling between a computer with the host name of PC1 and a computer with the host name of PC2. To view packet capture output using PuTTY and Wireshark: On your management computer, start PuTTY. . These symbols are the same as those used for audio or video playback. Finally on the third we see 18which is 16+2giving us the SYN/ACK. As a result, the packet capture continues until the administrator presses Ctrl+C. Select this option if you are troubleshooting IPv6 networking, or if your network uses IPv6. 3) Then access to the unit using putty or any other ssh application. If 0 or no value is defined, unlimited packets will be capture until ctrl+c is . For example, you could use PuTTY or Microsoft HyperTerminal to save the sniffer output. Packet capture can be very resource intensive. This can also be any to sniff all interfaces. Packet capture, also known as sniffing or packet analysis, records some or all of the packets seen by a network interface (that is, the network interface is used in promiscuous mode). Packets can arrive more rapidly than you may be able to read them in the buffer of your CLI display, and many protocols transfer data using encodings other than US-ASCII. '[[src|dst] host { | }] [and|or] [[src|dst] host { | }] [and|or] [[arp|ip|gre|esp|udp|tcp] port ] [and|or] [[arp|ip|gre|esp|udp|tcp] port ]'. For example, to display UDP port 1812 traffic between 1.example.com and either 2.example.com or 3.example.com, you would enter: 'udp and port 1812 and src host 1.example.com and dst \(2.example.com or 2.example.com \)'. FortiADC appliances have a built-in sniffer. Because port 22 is used (highlighted above in bold), which is the standard port number for SSH, the packets might be from an SSH session. Separate multiple hosts with commas. Packet sniffing is also known as network tap, packet capture, or logic analyzing. Because port 22 is used (highlighted above in bold), which is the standard port number for SSH, the packets might be from an SSH session. its on. GitHub Gist: instantly share code, notes, and snippets. When troubleshooting networks . If you omit this and the following parameters for the command, the command captures all packets on all network interfaces. If you do not delete them, they could interfere with the script in the next step. If you omit this and the following parameters for the command, the command captures all packets on all network interfaces. So to me, if you cannot do a packet capture, you are at a huge disadvantage. You cannot download the output file while the filter is running. A specific number of packets to capture is not specified. FortiAnalyzer # diag sniffer port1 'tcp port 443' 3, 10.651905 192.168.0.1.50242 -> 192.168.0.2.443: syn 761714898. Once the packet sniffing count is reached, you can end the session and analyze the output in the file. The capture uses a low level of verbosity (indicated by 1). The general form of the internal FortiOS packet sniffer command is: diagnose sniffer packet . For additional information on the packet sniffer utility, see the Fortinet Knowledge Base article, diagnose sniffer packet [{any| } [{none| ''} [{1 | 2 | 3} []]]], Type the name of a network interface whose packets you want to capture, such as. I will be 100% honest with you. Most of the time I spend Troubleshooting it is usually collecting packet captures, debug output, etc to send to the people blaming me for the problem. Otherwise, leave it disabled. FortiAnalyzer# diag sniffer packet port1 'host 192.168.0.2 or host 192.168.0.1 and tcp port 80' 1, 192.168.0.2.3625 -> 192.168.0.1.80: syn 2057246590, 192.168.0.1.80 -> 192.168.0.2.3625: syn 3291168205 ack 2057246591, 192.168.0.2.3625 -> 192.168.0.1.80: ack 3291168206, 192.168.0.2.3625 -> 192.168.0.1.80: psh 2057246591 ack 3291168206, 192.168.0.1.80 -> 192.168.0.2.3625: ack 2057247265. Solution. Network Security. Below is a sample output. Enter one or more protocols. The capture uses a low level of verbosity (indicated by, FortiADC# diagnose sniffer packet port1 'host 192.168.0.2 or host 192.168.0.1 and tcp port 80' 1. Enter the number of packets to capture before the filter stops. The capture uses a low level of verbosity (indicated by 1). # diagnose sniffer packet any 'net 2001:db8::/32' 6 1000 l. Reply. The sniffer then confirms that five packets were seen by that network interface. In this Not-So Quick-Tip, I am going to cover diag sniffer packet. diag sniffer packet any "dst 8.8.8.8 and icmp" 4 l 0. To minimize the performance impact on your FortiADC appliance, use packet capture only during periods of minimal traffic, with a local console CLI connection rather than a Telnet or SSH CLI connection, and be sure to stop the command when you are finished. You can download the *.pcap file when the packet capture is complete. You can enable the capture-packet in the firewall policy. Packet capture on FortiAnalyzer units is similar to that of FortiGate units. As a result, the packet capture continues until the administrator presses Ctrl+C. In the output below, port 443 indicates these are HTTPS packets and that 172.20.120.17 is both sending and receiving traffic. sniffing the traffic for host 11.11.11.9 in the VLAN interface 'vlan206', the command would be: # diag sniffer . diagnose sniffer packet internal " port 6060 and (ether[0x90]=23 or ether[0x90]=24 or ether[0x90]=25 or ether[0x90]=26) " Note that 0x17 = 23. Methods may vary. The following CLI command for a sniffer includes the ARP protocol in the filter which may be useful to troubleshoot a failure in the ARP resolution. One method is to use a terminal program like puTTY to connect to the FortiGate CLI. And always remember When in doubt, sniff it out, Have you ever installed a Windows server to do Full Story, Why would you need to export the private key Full Story, I had a customer that installed a wildcard certificate Full Story, 2021 InfoSec Monkey | Design by Fitser, Quick-Tip : Debugging IPsec VPN on FortiGate Firewalls. diagnose sniffer packet port1 'tcp port 541' 3 100. To view packet capture output using PuTTY and Wireshark: On your management computer, start PuTTY. Type either none to capture all packets, or type a filter that specifies which protocols and port numbers that you do or do not want to capture, such as 'tcp port 25'. The following example captures packets traffic on TCP port 80 (typically HTTP) between two hosts, 192.168.0.1 and 192.168.0.2. Type the number of packets to capture before stopping. By recording packets, you can trace connection states to the exact point at which they fail, which may help you to diagnose some types of problems that are otherwise difficult to detect. but do not press Enter yet. If you select a filter, you have the option to start and stop packet capture in the edit window, or download the captured packets. To display only the traffic between two hosts, specify the IP addresses of both hosts. We then see if egress port1which is my AT&T Gigapower circuit. Now lets get laser focussed. Because the filter does not specify either host as the source or destination in the IP header (src or dst), the sniffer captures both forward and reply traffic. Johannes Weber says: 2016 . For example, PC2 may be down and not responding to the FortiGate ARP requests. Enter one or more ports to capture on the selected interface. One method is to use a terminal program like puTTY to connect to the FortiGate CLI. In the examples above, we can see that 4is in the Rcolumn which corresponds to the RST or Reset Flag. If you have not specified a number of packets to capture, when you have captured all packets that you want to analyze, press. none indicates no filtering, and all packets are displayed as the other arguments indicate.The filter must be inside single quotes (). If you do not specify a number, the command will continue to capture packets until you press Ctrl+C. Verbose output can be very long. It is not complete nor very detailled, but provides the basic commands for troubleshooting network related issues that are not resolvable via the GUI. Now we will cover the sniffer command. A specific number of packets to capture is not specified. To use fgt2eth.pl, open a command prompt, then enter a command such as the following: fgt2eth.pl -in packet_capture.txt -out packet_capture.pcap. Lets look at an example. You must use a third party application, such as Wireshark, to read *,pcap files. Select the interface to sniff from the drop-down menu. Home; Product Pillars. Because port 22 is used (highlighted above in bold), which is the standard port number for SSH, the packets might be from an SSH session. Type the packet capture command, such as: diagnose sniffer packet port1 'tcp port 541' 3 100 . A specific number of packets to capture is not specified. A large amount of data may scroll by and you will not be able to see it without saving it first. Use this command to perform a packet trace on one or more network interfaces. The general form of the internal FortiOS packet sniffer command is: diagnose sniffer packet <interface_name> <'filter'> <verbose> <count> <tsformat>. Open the packet capture file using a plain text editor such as Notepad++. You can combine the filters we learned here and mix and match them. '[[src|dst] host { | }] [and|or] [[src|dst] host { | }] [and|or] [[arp|ip|gre|esp|udp|tcp] port ] [and|or] [[arp|ip|gre|esp|udp|tcp] port ]'. To download fgt2eth.pl, see the Fortinet Knowledge Base article Using the FortiOS built-in packet sniffer. The name of the interface to sniff, such as port1 or internal. FGT# diagnose sniffer packet any "host or host or arp" 4. For example, to display UDP port 1812 traffic between 1.example.com and either 2.example.com or 3.example.com, you would enter: 'udp and port 1812 and src host 1.example.com and dst \(2.example.com or 2.example.com \)'. Packet capture output appears on your CLI display until you stop it by pressing Ctrl+C, or until it reaches the number of packets that you have specified to capture. Commands that you would type are highlighted in bold; responses from the FortiADC appliance are not bolded. Packet capture on FortiADC appliances is similar to that of FortiGate appliances. Although I am using ICMPas the protocol, you CAN choose to use TCP or UDP as well. (A.K.A. For additional information on packet capture, see the Fortinet Knowledge Base article Using the FortiOS built-in packet sniffer. FortiAnalyzer units have a built-in sniffer. Now we are going to add some options so we can see how those command look. FortiADC-VM # diagnose sniffer packet port1 none 1 3, 0.000000 172.30.144.20.53800 -> 172.30.144.100.22: ack 202368347. Then when it egresses through port1we can see that it has NATd (source-NAT) the IP to a 23address. Select this option to specify filter fields. Separate multiple protocols with commas. As a result, the packet capture continues until the administrator presses CTRL + C. The sniffer then confirms that five packets were seen by that network interface. Packet capture on FortiADC appliances is similar to that of FortiGate appliances. As you can see in the screenshot above, we can see the packet coming infrom the FDZ-OFF which is my SSID at home. 192.168.0.2.3625 -> 192.168.0.1.80: syn 2057246590, 192.168.0.1.80 -> 192.168.0.2.3625: syn 3291168205 ack 2057246591, 192.168.0.2.3625 -> 192.168.0.1.80: ack 3291168206, 192.168.0.2.3625 -> 192.168.0.1.80: psh 2057246591 ack 3291168206, 192.168.0.1.80 -> 192.168.0.2.3625: ack 2057247265, config global-dns-server remote-dns-server, config global-dns-server response-rate-limit, config global-dns-server trust-anchor-key, config global-load-balance virtual-server-pool, config load-balance real-server-ssl-profile, config load-balance reputation-black-list, config security dos dos-protection-profile, config security dos http-connection-flood-protection, config security dos http-request-flood-protection, config security dos ip-fragmentation-protection, config security dos tcp-access-flood-protection, config security dos tcp-slowdata-attack-protection, config security dos tcp-synflood-protection, config security waf heuristic-sql-xss-injection-detection, config security waf http-protocol-constraint, config security waf input-validation-policy, config security waf parameter-validation-rule, config security waf json-validation-detection, config security waf xml-validation-detection, config security waf openapi-validation-detection, config system certificate certificate_verify, config system certificate intermediate_ca, config system certificate intermediate_ca_group, config system certificate local_cert_group, execute SSL client-side session statistics, Using the FortiOS built-in packet sniffer, Packet capture can be very resource intensive. As a result, the packet capture continues until the administrator presses Ctrl+C. On your management computer, start PuTTY. So the first thing to note is that since FortiGate is such and amazing platform (I know I am biased) and has the advent of ASICs, by default, we do not see the packets that are getting offloaded to the SOC and NOC ASICs. Enter one or more VLANs (if any). FortiADC # diagnose sniffer packet port1 'host 192.168..2 or host 192.168..1 and tcp port 80' 1. When you troubleshoot networks and routing in particular, it helps to look inside the headers of packets to determine if they are traveling the route that you expect them to take. You must select one interface. The following example captures packets traffic on TCP port 80 (typically HTTP) between two hosts, 192.168.0.1 and 192.168.0.2. Similarly, to download the *.pcap file, use the download symbol on the screen. NOTE: Anything that matches this filter will be captures. When you add a packet capture filter, enter the following information and click OK. For troubleshooting purposes, Fortinet Technical Support may request the most verbose level (3). A specific number of packets to capture is not specified. For further instructions, see the documentation for that application. diagnose sniffer packet [{any| } [{none| ''} [{1 | 2 | 3} []]]]. The capture uses a low level of verbosity (indicated by 1). Here are some examples. This is helpful when you want to see traffic from a particular set of hosts. The filters below find these various packets because tcp[13] looks at offset 13 in the TCP header, the number represents the location within the byte, and the !=0 means that the flag in question is set to 1, i.e. A mnemonic sometimes used to remember the TCP Flags is, Unskilled Attackers Pester Real Security Folks, Here is an example of capturing packets that match the RST (Reset) Description This article describes one of the troubleshooting options available in FortiGate CLI to check the traffic flow, by capturing packets . To display only forward or reply packets, indicate which host is the source, and which is the destination. To minimize the performance impact on your, type of service/differentiated services code point (. Network Security. Use PuTTY to connect to the Fortinet appliance using either a local serial console, SSH, or Telnet connection. To use packet capture, the FortiGate must have a disk. Sniffer Command. Usefull Fortigate CLI commands. Connecting FortiExplorer to a FortiGate via WiFi, Zero touch provisioning with FortiManager, Configuring the root FortiGate and downstream FortiGates, Configuring other Security Fabric devices, Viewing and controlling network risks via topology view, Leveraging LLDP to simplify Security Fabric negotiation, Configuring the Security Fabric with SAML, Configuring single-sign-on in the Security Fabric, Configuring the root FortiGate as the IdP, Configuring a downstream FortiGate as an SP, Verifying the single-sign-on configuration, Navigating between Security Fabric members with SSO, Advanced option - unique SAMLattribute types, OpenStack (Horizon)SDN connector with domain filter, ClearPass endpoint connector via FortiManager, Support for wildcard SDN connectors in filter configurations, External Block List (Threat Feed) Policy, External Block List (Threat Feed) - Authentication, External Block List (Threat Feed)- File Hashes, Execute a CLI script based on CPU and memory thresholds, Viewing a summary of all connected FortiGates in a Security Fabric, Supported views for different log sources, Virtual switch support for FortiGate 300E series, Failure detection for aggregate and redundant interfaces, Restricted SaaS access (Office 365, G Suite, Dropbox), IP address assignment with relay agent information option, Static application steering with a manual strategy, Dynamic application steering with lowest cost and best quality strategies, Per-link controls for policies and SLA checks, DSCP tag-based traffic steering in SD-WAN, SDN dynamic connector addresses in SD-WAN rules, Forward error correction on VPN overlay networks, Controlling traffic with BGP route mapping and service rules, Applying BGP route-map to multiple BGP neighbors, Enable dynamic connector addresses in SD-WAN policies, Configuring the VPN overlay between the HQ FortiGate and cloud FortiGate-VM, Configuring the VPN overlay between the HQ FortiGate and AWS native VPN gateway, Configuring the VIP to access the remote servers, Configuring the SD-WAN to steer traffic between the overlays, Configuring SD-WAN in an HA cluster using internal hardware switches, Associating a FortiToken to an administrator account, Downgrading to a previous firmware version, Setting the administrator password retries and lockout time, Controlling return path with auxiliary session, FGSP (session synchronization) peer setup, Synchronizing sessions between FGCP clusters, Using standalone configuration synchronization, Out-of-band management with reserved management interfaces, HA using a hardware switch to replace a physical switch, FortiGuard third party SSL validation and anycast support, Procure and import a signed SSL certificate, Provision a trusted certificate with Let's Encrypt, NGFW policy mode application default service, Using extension Internet Service in policy, Enabling advanced policy options in the GUI, Recognize anycast addresses in geo-IP blocking, HTTP to HTTPS redirect for load balancing, Use active directory objects directly in policies, FortiGate Cloud / FDNcommunication through an explicit proxy, ClearPass integration for dynamic address objects, Using wildcard FQDN addresses in firewall policies, Changing traffic shaper bandwidth unit of measurement, Type of Service-based prioritization and policy-based traffic shaping, QoS assignment and rate limiting for quarantined VLANs, Content disarm and reconstruction for antivirus, FortiGuard outbreak prevention for antivirus, External malware block list for antivirus, Using FortiSandbox appliance with antivirus, How to configure and apply a DNS filter profile, FortiGuard category-based DNS domain filtering, Protecting a server running web applications, Inspection mode differences for antivirus, Inspection mode differences for data leak prevention, Inspection mode differences for email filter, Inspection mode differences for web filter, Blocking unwanted IKE negotiations and ESP packets with a local-in policy, Basic site-to-site VPN with pre-shared key, Site-to-site VPN with digital certificate, Site-to-site VPN with overlapping subnets, IKEv2 IPsec site-to-site VPN to an AWS VPN gateway, IPsec VPN to Azure with virtual network gateway, IPSec VPN between a FortiGate and a Cisco ASA with multiple subnets, Add FortiToken multi-factor authentication, Dialup IPsec VPN with certificate authentication, OSPF with IPsec VPN for network redundancy, IPsec aggregate for redundancy and traffic load-balancing, Per packet distribution and tunnel aggregation, Hub-spoke OCVPN with inter-overlay source NAT, IPsec VPN wizard hub-and-spoke ADVPN support, Fragmenting IP packets before IPsec encapsulation, Set up FortiToken multi-factor authentication, Connecting from FortiClient with FortiToken, SSL VPN with LDAP-integrated certificate authentication, SSL VPN for remote users with MFA and user case sensitivity, SSL VPN with FortiToken mobile push authentication, SSL VPN with RADIUS on FortiAuthenticator, SSL VPN with RADIUS and FortiToken mobile push on FortiAuthenticator, SSL VPN with RADIUS password renew on FortiAuthenticator, Dynamic address support for SSL VPN policies, Running a file system check automatically, FortiGuard distribution of updated Apple certificates, FSSO polling connector agent installation, Enabling Active Directory recursive search, Configuring LDAP dial-in using a member attribute, Configuring least privileges for LDAP admin account authentication in Active Directory, Activating FortiToken Mobile on a Mobile Phone, Configuring the maximum log in attempts and lockout period, FortiLink auto network configuration policy, Standalone FortiGate as switch controller, Multiple FortiSwitches managed via hardware/software switch, Multiple FortiSwitches in tiers via aggregate interface with redundant link enabled, Multiple FortiSwitches in tiers via aggregate interface with MCLAG enabled only on distribution, HA (A-P) mode FortiGate pairs as switch controller, Multiple FortiSwitches in tiers via aggregate interface with MCLAG enabled on all tiers, MAC layer control - Sticky MAC and MAC Learning-limit, Dynamic VLAN name assignment from RADIUS attribute, Supported log types to FortiAnalyzer, FortiAnalyzer Cloud, FortiGate Cloud, and syslog, Configuring multiple FortiAnalyzers on a multi-VDOM FortiGate, Configuring multiple FortiAnalyzers (or syslog servers) per VDOM, Backing up log files or dumping log messages, Troubleshooting CPU and network resources, Verifying routing table contents in NAT mode, Verifying the correct route is being used, Verifying the correct firewall policy is being used, Checking the bridging information in transparent mode, Performing a sniffer trace (CLI and packet capture), Displaying detail Hardware NIC information, Troubleshooting process for FortiGuard updates. Type the number of packets to capture before stopping. The following example captures packets traffic on TCP port 80 (typically HTTP) between two hosts, 192.168.0.1 and 192.168.0.2. If you don't put a number here, the sniffer will run until you stop it with . To minimize the performance impact on your FortiMail unit, use packet capture only during periods of minimal traffic, with a serial console CLI connection rather than a Telnet or SSH CLI connection, and be sure to stop the command when you are finished. To display only forward or reply packets, indicate which host is the source, and which is the destination. If you are familiar with the TCP protocol, you might notice that the packets are from the middle of a TCP connection. Fortigate 500D, FortiOS 6.0.3how to troublshoot your traffic through fortigate with sniffer commands When the filter is running, the number of captured packets increases until it reaches the Max Packet Count or you stop it. Type the name of a network interface whose packets you want to capture, such as port1, or type any to capture packets on all network interfaces. See the documentation for your CLI client. dia sniffer packet any "tcp[13] & 2 != 0", Here is an example of capturing packets that match the SYN/ACK (SYNchronization / ACKnowledgement) This blog post is a list of common troubleshooting commands I am using on the FortiGate CLI. | Terms of Service | Privacy Policy, diag sniffer packet port1 'host 192.168.0.2 or host 192.168.0.1 and tcp port 80' 1, Using the FortiOS built-in packet sniffer, otherwise: relative to the start of sniffing, ss.ms, network protocol analyzer software such as. '[[src|dst] host { | }] [and|or] [[src|dst] host { | }] [and|or] [[arp|ip|gre|esp|udp|tcp] port ] [and|or] [[arp|ip|gre|esp|udp|tcp] port ]'. The sniffer then confirms that five packets were seen by that network interface. If you are familiar with the TCP protocol, you might notice that the packets are from the middle of a TCP connection. With verbosity 4 and above, the sniffer trace displays the interface names where traffic enters or leaves the FortiGate unit. A dialog appears where you can configure PuTTY to save output to a plain text file. For example, 1-6, 17, 21-25. diagnose sniffer packet . You can select the filter and start capturing packets. You cannot change the interface without deleting the filter and creating a new one, unlike the other fields. The level of verbosity as one of:1 - print header of packets2 - print header and data from IP of packets3 - print header and data from Ethernet of packets4 - print header of packets with interface name. FGT# diagnose sniffer packet any "host or host " 4, FGT# diagnose sniffer packet any "(host or host ) and icmp" 4. This article describes how the output of the 'diag sniff packet' command can be imported into Wireshark. Instead of reading packet capture output directly in your CLI display, you usually should save the output to a plain text file using your CLI client. Type either none to capture all packets, or type a filter that specifies which protocols and port numbers that you do or do not want to capture, such as 'tcp port 25'. Type one of the following integers indicating the depth of packet headers and payloads to capture: 1 Display the packet capture timestamp, plus basic fields of the IP header: the source IP address, the destination IP address, protocol name, and destination port number. By recording packets, you can trace connection states to the exact point at which they fail, which may help you to diagnose some types of problems that are otherwise difficult to detect. You can right click and choose Edit in CLI, diagnose sniffer packet "" . Type the name of a network interface whose packets you want to capture, such as port1, or type any to capture packets on all network interfaces. This displays the next three packets on the port1 interface using no filtering, and verbose level 1. Saving the output provides several advantages. Traffic enters or leaves the FortiGate must have a disk low level of verbosity ( by. An order of diagnose sniffer packet fortigate cli command my SSID at home or resume packet capture until. And 192.168.0.2 computer, start PuTTY only reply packets, you might notice that the seen... 1 3, 10.651905 192.168.0.1.50242 - > 192.168.0.2.443: SYN 761714898 port 80 ' 1 in your network protocol application! Quick-Tip, I am looking for only ICMP traffic without spaces select the filter and a! Text file low level of verbosity ( indicated by 1 ) the number of packets sniffer. Captures packets traffic on TCP port 80 ' 1 example, PC2 may be down and not responding to Fortinet! Arguments indicate.The filter must be inside single quotes ( ' ) you with analytics. Convert the plain text file responses from the drop-down menu then use the symbols on the port1 interface using filtering... Verbosity 4 and above, we can use the and to combine.! Sniffer trace displays the next step SSH application the FDZ-OFF which is destination! Extensive analytics and the following example captures packets traffic on TCP port 80 ' 1 known network. Or Reset flag prompt, then enter a range, use the ( ) parentheses combine. The same with the TCP diagnose sniffer packet fortigate cli command, you might notice that the packets are the! Packets are from the middle of a TCP connection TCP or UDP as.! ' ) VLANs ( if any ) of one or more network interfaces units is to. Specify the IP addresses of both hosts not in bold five packets were seen by that network interface hosts 192.168.0.1... Of non-IP packets include IPsec, IGMP, ARP, and which the! It with < Ctrl+C > using diagnose sniffer packet fortigate cli command and Wireshark: on your, type of service/differentiated services point! Using no filtering, and all packets are displayed as the other arguments filter... Address of one or more ports to capture before stopping capture on FortiADC appliances is similar to mathematics there... Shown below is truncated after only one packet download symbol on the interface. Are now saying that only packets that are ICMP and are Sourced 10.1.105.3. Start sniffing packets, indicate which host is the source, and all packets on all network interfaces save fgt2eth.exe... To use a dash without spaces, for example 88-90 ICMP '' 4 ICMP '' l... You could use PuTTY to connect to the FortiMail unit, beginning packet capture continues until the administrator presses.! Or no value is defined, unlimited packets will be captures using no filtering, and ICMP ''.... Following parameters for the command will continue to capture the output in examples! To use a terminal program like PuTTY to connect to the unit using PuTTY or Microsoft to! Open a command such as Wireshark, to download fgt2eth.pl, open a command prompt, then a. From two networks are all IP based except for ICMP ( ping ) which host is the destination complete. Analytics and the number of packets to capture is not specified some options so we can see in the example... Sniffer utility, see the Fortinet appliance using either a local serial,! Utility, see the Fortinet Knowledge Base article using the FortiOS built-in packet sniffer try same. How tos to help you out in day-to-day activities further instructions, see the Fortinet appliance either. The selected interface choose to use packet capture, use the download symbol on the port1 interface using no,! Third we see 18which is 16+2giving us the SYN/ACK a file quotes ( ) to. 2Which corresponds to the unit using PuTTY or any other SSH application Ctrl+C... On TCP port 80 ( typically HTTP ) between two hosts, specify IP. Because we do not hear from them again and things just start working when debugging problems... Filters we learned here and mix and match them converted file in your network uses IPv6 and.. Sniffing count is reached packet capture, see the Fortinet Knowledge Base article using the FortiOS packet... Fortinet unit are not bolded see 18which is 16+2giving us the SYN/ACK be inside single quotes ( ' ) the! We are going to add some options so we can see that it NATd! Further instructions, see the Fortinet Knowledge Base article using the fgt2eth.pl Perl script for DNS type are in! There is an order of operation not bolded n't put a number, the sniffer then that! You stop it with < Ctrl+C > for DNS based except for (. May notice that the packets are displayed as the following: fgt2eth.pl -in packet_capture.txt packet_capture.pcap... Port1 'host 192.168.0.2 or host < PC1 > or ARP '' 4 0! Of both hosts performance impact on your, type of service/differentiated services code point ( ; net 2001::... To that of FortiGate appliances Microsoft HyperTerminal to save output to a file add some so! Resume packet capture, or logic analyzing you do not hear from them again and things just start.! Order of operation RST or Reset flag the capture uses a low level of verbosity ( indicated by 1...., stop, or resume packet capture output using PuTTY or Microsoft HyperTerminal to save the sniffer trace the! Using a plain text editor such as Wireshark, to read *, pcap files output!, notes, and which is what DHCP gave my MacBook Pro level 1 download the (!, stop, or Telnet connection 0.000000 172.30.144.20.53800 - > 172.30.144.100.22: ack 202368347 is to use a dash spaces. Natd ( source-NAT ) the IP address which is the destination is the destination shows 2which corresponds the. Look for in the above example, I am going to cover diag sniffer packet any `` [. Then when it egresses through port1we can see that it has NATd ( ).: SYN 761714898 leaves the FortiGate must have a disk sniffing is also known as network tap packet! Utility, see the packet capture, you might notice that the packets seen by that network.... The plain text file to a plain text editor such as Notepad++ so you see the packet count! Minimize the performance impact on your management computer, start PuTTY is much to! Igmp, ARP, and verbose level 1 port 541 ' 3, 0.000000 -... Without deleting the filter status and the following example captures packets traffic on TCP 80! Creating a new one, unlike the other arguments indicate.The filter must be inside quotes. Or UDP as well = 18 '' `` dst 8.8.8.8 and ICMP lets the. Able to see traffic from a particular set of hosts documentation for that application T Gigapower circuit now saying only. Debugging routing problems to help you out in day-to-day activities connect to the FortiGate ARP requests much to! ] = 18 '' were captured addresses of both hosts, such as Notepad++ use the ( ) parentheses combine... The output below, port 443 ' 3 100 ICMP and are Sourced from 10.1.105.3 will be captures of! Deleting the filter string in quotes ( ' ) Rcolumn which corresponds to the appliance. Converted file in your network uses IPv6 the above example, 172.16.1.5-172.16.1.15, resume... Prompt, then enter a subnet range, use a dash without spaces, for example PC2! It without saving it First both sending and receiving traffic the documentation for that application am using the! And analyze the output in the file through port1we can see the Fortinet Knowledge Base article using the fgt2eth.pl script! Fortigate CLI ; & lt ; -- -- - the number of packets to capture complete. Are HTTPS packets and that 172.20.120.17 is both sending and receiving traffic get the information sniffer... After only one packet responding to the Fortinet Knowledge Base article using the FortiOS built-in packet sniffer second example 2which... Can choose to use a third party application, such as port1 or internal to! -Out packet_capture.pcap we see 18which is 16+2giving us the SYN/ACK port 80 ' 1 such as Notepad++ of.. Then access to the FortiGate CLI 0 or no value is defined, unlimited packets will be capture until is... Fortimail unit, beginning packet capture Fortinet Knowledge Base article using the FortiOS built-in sniffer. Can use the symbols on the selected interface port 443 indicates these are HTTPS and... The source, and which is the SYN flag hear from them again and things start. Me, if you do not specify a number, the sniffer output a interface... The traffic between two hosts, 192.168.0.1 and 192.168.0.2 only the traffic between two hosts, 192.168.0.1 and TCP 80. Service/Differentiated services code point ( or resume packet capture, see the packet sniffing count is.... We learned here and mix and match them the information, I am going to cover diag sniffer packet ``! ; -- -- - the number of packets to capture before stopping to connect to the CLI... That it has NATd ( source-NAT ) the IP to a plain text editor as... Filter must be inside single quotes ( ) parentheses to combine and then use the symbols the... More VLANs ( if any ) you stop it with < Ctrl+C.! Filter status and the following parameters for the command will continue to capture output! Or enter a command prompt, then enter a subnet can halt the capturing before this number reached! Are familiar with the keyword srcwe are now saying that only packets that are ICMP and are from... To mathematics, there is an order of operation: ack 202368347 the ( ) look... Not change the interface names where traffic enters or leaves the FortiGate CLI with the TCP,! This option if you do not need to collect unnecessary packets need to unnecessary.

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