Jim Dixon says:
You can send from a very large network and forge your TCP/IP or (more difficult) Ethernet source address. But I can sit on the same network, build a table relating TCP/IP to ethernet (or whatever) addresses, and filter out messages that should not be there. There are commerical packages that do this sort of thing.
Huh? If you are sitting on a network in England, which you appear to be, I defy you to record anything at all about the ethernet addresses of the machines that originated this message. I'll happily telnet to your machine any time you like, and give you all the opportunity you like to record the ethernet address of my packets. You might be on the same internet, but you very likely have no access to the original physical network, and you have no capacity to build any tables of any sort. Perry