Forum Discussion

Nimbostratus

Apr 17, 2020

Find connection attempts via source IP

Hey guys, I'm fairly new to F5. We have one configured before I started working here. We have a windows terminal server virtual server in our F5 that load balances between 18 different back end termi...

Apr 20, 2020

when CLIENT_ACCEPTED {
  set LogString "Client [IP::client_addr]"
  log local0. "==== $LogString (request) ====="
}
 
when SERVER_CONNECTED {
  log local0. "==== $LogString (server connected) - server: [LB::server addr]:[LB::server port] ===="
}

I have tested that this works

Beaker

Cirrus

You can accomplish this with an Irule on the VIP that would log the connections and output them into the ltm log.

Something like this should help with troubleshooting. But I would only use while troubleshooting not as a permanent addition:

when HTTP_REQUEST {
  set LogString "Client [IP::client_addr]:[TCP::client_port] -> Requested Host[HTTP::host][HTTP::uri]"
  log local0. "==== $LogString (request) ====="
}
 
when SERVER_CONNECTED {
  log local0. "==== $LogString (server connected) - server: [LB::server addr]:[LB::server port] ===="
}
 
when HTTP_RESPONSE {
  log local0. "==== $LogString (response) - status: [HTTP::status] ===="
}