Forum Discussion
MVPNo traffic flowing when running tcpdump
Hello!!!
I need your help!
When setting interface mirror, I want to check the traffic to the mirror port. When using tcpdump -nei 1.1, no traffic flows to the mirror port. If you turn off tcpdump, traffic flows.
If you know the cause please let me know.
dest mirror port: 1.1 // mirrored port: 1.2, 1.3
Thank you.
Kurt_EricksonEmployee
K65535212: Limitation of using the tcpdump utility on mirrored interfaces
neeeewbieThanks!
How do I check a packet without using the tcpdump command?
- Anjuli_Lam
You should use an external capture device attached to the network interface to analyze (sniff) traffic that is mirrored to the interface. Hope that helps!
Rodrigo_AlbuqueCirrocumulus
Are you trying to capture on the Standby? If this is L7 mirroring then try tcpdump on the same interface you'd receive external traffic if the box were Active.
- neeeewbie
yes, F5 team release new note relate to this situaltion
