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

Forum Discussion

David_Edwards_2's avatar
David_Edwards_2
Icon for Nimbostratus rankNimbostratus
Nov 09, 2006

Persistence with UDP

Hello, not sure if this is under the right section.     The problem we have is we need to loadbalance UDP connections across a pool of servers.     All UPD packets come from the same sour...
application delivery
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JRahm's avatar
JRahm
Icon for Admin rankAdmin
Nov 09, 2006
You could try something like this:


when CLIENT_ACCEPTED {
    set src_IP [IP::client_addr]
    if { [session lookup uie $src_IP] equals "" } {
      session add uie $src_IP [UDP::remote_port] 1800
      log local0. "added client port [session lookup uie $src_IP] for client ip $src_IP "
    } else {
      log local0. "existing client port [session lookup uie $src_IP] for client ip $src_IP"
    }
}

Untested, but it did pass the LTM syntax checker on 9.1.2.

Jason