native recording of all network connections on freebsd

I'm wondering if anyone can help point me at a good way to continously 
capture every inbound and outbound connection made to a freebsd system. 
I'd prefer a way that is native in base if possible.   I don't really want 
to record all the packets, just the src:dest:rport:dport stats.

Happy to RTFM as well,

Dan