How to log NAT translations

[spookycave]

Hi, wondering how to log each NAT translation.  Ideally I'd like to log it to a file, and also send to a syslog server.  This would be to correlate public NAT ip address back to private address later.
thanks
Mike

[GruensFroeschli]

Enabling logging for allow firewall rules, logs when a state is establisHed.

[spookycave]

Thanks, much appreciated.
Mike