1. man 4 bpf from BSD system.
2. BPF paper
	http://citeseer.nj.nec.com/mccanne92bsd.html
3. http://ourmon.cat.pdx.edu/ourmon - PSU ourmon system
	note: user-mode BPF code is not available yet, except privately
	from me
4. http://ourmon.cat.pdx.edu/ourmon/info.html - ourmon info page

Test tools:

1. ping 
	note -c for pkt count
	     -f for flood ping

2. ttcp
tcp memory to memory
	xmit:
	# ttcp -t -s -f m ip

	recv:
	# ttcp -r -s -f m

Note 
	1. -u for udp ... can use this one way ...  (don't need a recv side)
	2. -p for ports

3. more advanced possibilities include:

	use tcpdump to write packets to a file.
	tcpdump -w file

	tcpreplay - to play them back

	This needs thought about the test setup.