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

Forum Discussion

DP's avatar
DP
Icon for Nimbostratus rankNimbostratus
Feb 17, 2016

Node selection for non-HTTP traffic

I've setup a standard VS with no HTTP profile applied, only TCP. The protocol I'd like to load balance is custom and TCP-based. There's 1 iRule applied which I've based on this: https://devcentral....
application delivery
irules
LTM
VernonWells's avatar
VernonWells
Icon for Employee rankEmployee
Feb 17, 2016

Ordinarily, the server-side connection is initiated at the completion of the client-side three-way handshake, so the order of events should be:

  1. CLIENT_ACCEPTED
  2. LB_SELECTED
  3. SERVER_CONNECTED
  4. CLIENT_DATA

Since you execute the 

node
command in CLIENT_DATA, this may raise LB_SELECTED again, but it would have no effect, since the server-side is already connected. Try performing an LB::detach before the 
node
command.