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ESP can be used to log connections to a virtual service by IP even if ESP is not used for user authentication.
Enable ESP on the relevant virtual service and under ESP logging enable "Connection". Then Set Client Authentication mode to "Delegate to server" (in previuos firmware this is "none") and enter your "Allowed Virtual Hosts, multiple hosts can be specified, using space separated.
Under "Allowed Virtual Directories" use "/*". And under Pre-Authorization Excluded Directories use "/*"
This means all requests will be pre-excluded and therefore passed to the server, however the option under ESP logging will ensure all connections are logged by IP address.
Logs can be viewed under
Logging Options-Extended Log files - ESP Connection Log.