This is off-topic, but isn't UDP making data retention more difficult than TCP/IP.
I don't see how .. "tcpdump -s 1514 -w evidence.pcap ip proto \\udp" is any harder than .. "tcpdump -s 1514 -w evidence.pcap ip proto \\tcp"Now I guess you could rig a communications "network" that dealt entirely in header-source forged UDP packets, but as best practices dictate (not the everybody follows them) .. one should filter egress of packets with a source address not within your netblock.
Cheers, Michael Holstein Cleveland State University