Non dropping packet monitor

[Paul Haddad]

Hi All,

I need to monitor packets flowing in/out of a freebsd 6.x box in a
tcpdump/pcap (monitor only) style but I can't have packets dropped as
tcpdump often does when its buffer fills up.

I'm fine if the entire network connection slows down because of this,
the important thing is that I can get access to each and every packet
on a given interface.

Any suggestions?  Is there some pcap option that I need to look at?
--
Paul Haddad (paul.haddad at gmail.com paul at pth.com)