Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

Forum Discussion

mdiamore_227819's avatar
mdiamore_227819
Icon for Nimbostratus rankNimbostratus
7 years ago

VS fails to process ANY traffic

Currently attempting to configure my F5 to support unidirectional UDP forwarding of raw NetFlow from an upstream router but struggling to move traffic.   I can see traffic landing on 1.1 in the...
application delivery
big-ip
LTM
udp
virtual server
AceDawg1's avatar
AceDawg1
Icon for Nimbostratus rankNimbostratus
7 years ago

So you exchanged addresses, correct? Is this the current config:

  1. VIP: 10.X.X.254
  2. Self-IP: 10.X.X.250

When you run a tcpdump (see below) on the virtual server address, are you seeing traffic?

tcpdump -xxvvi 0.0:nnn -s 0 host 10.X.X.254 and port 9989 -w /tmp/devcentral-01.pcap

Dumb question but have to ask: no firewalls between the router and the F5, correct?