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. Packet capture on FortiADC appliances is similar to that of FortiGate appliances.

Spectrum uses the above technique to get the correct IP address. FortiADC appliances have a built-in sniffer. Observing a WireShark packet capture for both working and non-working scenarios: So the Fortinet device is sending the wrong SNMP response. In short, the above command will capture all traffic on the Ethernet device and write it to a file named tcpdump.pcap in a format compatible with Wireshark. It appears that Fortinet recently added support for 1.3.6.1.2.1.4.34.1.3 OID in their latest firmware. 1.10.115.236.21.50:50) after appending an extra IfIndex number and misses the type in response to the SNMP 1.3.6.1.2.1.4.34.1.3 OID request, which is causing this problem. The issue is caused by a change on the Fortigate device itself due to the latest firmware.

Fortigate packet capture wireshark