I just use tcpdump:

tcpdump -i eth0 -vvv host amprgw.sysnet.ucsd.edu or ip proto \icmp tcpdump -vvv -s0 -n proto ipencap

I would recommend amprnet operators starting a network analyzer on your network (like wireshark) every time you have made a configuration change, added some equipment, or just have a few minutes of time to spend.