Identify the individual servers behind a VIP where the requests goes.

Hi N.,

there are multiple ways to get it done.

Without changing the configuration or adding iRules you can use the tcpdump utility with the

😛

switch in the context of tracing the internal interface:

tcpdump -i 0.0:nnnp -c 100 -s 0 

The

p

stands for "peer" and will return the serverside traffic associated with the traffic seen on clientside.

This feature was added in v11.2 if I remember right.

In case you are using cookie persistence you can use a browser plugin to monitor the inserted cookies as they reflect the servers IP and port after decoding.

If you know specific patterns in traffic, i.e. a JSESSIONID containing a server specific string you can look after this.

If you have the chance to modify your units configuration you can apply iRules to log an incoming connection/request i.e. in context of CLIENT_ACCEPTED or HTTP_REQUEST and the selected server i.e. in context of LB_SELECTED, SERVER_CONNECTED or HTTP_REQUEST_SEND.

The options here depend on the protocol your are using to provide the service and applied features i.e. as

one-connect

. That´s why it is not possible to provide a detailed solution without further specification from your side.

Thanks, Stephan