how to check logs of session between client IP and pool member

LB never send logs of successful/Unsuccessfully session until defined. To achieve this We suggest to add external Log Sever[Splunk, Syslog, etc] and configure High Speed Login profile in F5.

Don't send all the traffic log to local f5 syslog DB. It will fill quickly and F5 performance will be slow.

Thanks

If you are looking this info for troubleshooting, you can use the tmsh commands to list the connections.

tmsh show sys connection cs-client-addr <source-ip>

Note: Do not run tmsh show sys connection alone, this give a large number of records and sometimes the tmm might disrupt. Ultimately resulting in a failover.

There are many properties to use,

1.  cs-client-addr  --> Specifies the clientside remote address of the active connections. Subnets are supported.
2.  cs-server-addr  --> Specifies the clientside local address of the active connections. Subnets are supported.
3.  ss-client-addr  --> Specifies the serverside local address of the active connections.
4.  ss-server-addr  --> Specifies the serverside remote address of the active connections.

This will nicely show you the connection status of a source.

If your intention is show the selected server for logging, you can use local logging or HSL logging, this depends purely on troubleshooting purpose or Audit purpose. If its for sometime, use local logging. Else use HSL logging.

when CLIENT_ACCEPTED {
log local0. "TCP connection from [IP::client_addr]:[TCP::client_port] to [IP::local_addr]:[TCP::local_port]"
}
when HTTP_REQUEST_SEND {
	clientside {
	HTTP::header insert Selected-Server [LB::server addr]
        log local0. "Selected-Server [LB::server addr]"
   }
}

With the above method, you are capturing client accepted and then also the server selected information and inserting the selected server as a header property, so that the server team can extract this info too.