What's the most effective way to monitor SSH access in Gentoo Linux?
My Gentoo box is operating locally behind my broadband router. I have SSH port forwarding on the router and a DNS entry pointing to my router on the internet. Is there a way to silently record what external domain/IP the incoming connection to my Gentoo box comes from?
Similarly what's the best method of recording all network traffic to and from this box, again without being noisy about it?