What about spoofing IPs? What about the P2P network scanners, like B*yT*p? Their engineers are smart enough to make software used by routers. They pay for so much bandwidth, would upstream providers care if an anti-P2P company were sending packets into their backbone with spoofed IPs?

In this case, what good is PeerGuardian .. or any other IP blocklist? Couldn't they continue a charade of using known IPs, while the real work is done from spoofed IPs (only using alternative methods when necessary)?

For blocking spammers, blacklists work great. The top-tier backbone providers would crack down on an "enemy" spewing packets with spoofed IPs, but for the RIAA and others, big $$$ translates to turning blind eye. Given enough money, just about anything is possible, and the RIAA's constituents are desparate enough to spend a whole lot of money.

Also, with soo much $$$, couldn't they afford to just change their IPs every few days (hours?)?

2 cents,
Mr. Not-So-Anonymous

"Furthermore, .. it is very common for hackers to disguise their activities by putting RFC 1918 addresses in 'spoofed' packets (see the above discussion about spoofed packets). "
[http://www.iana.org/faqs/abuse-faq.htm#FabricatedorspoofedIPaddresses]

Sounds kinda lame to try and use PeerGuardian or an IP filter/blocklist, if its sooo easy to use fake IP addresses ...

Apparently, if the anti-P2P scanner/monitoring companies are using spoofed IPs, then it is far beyond an average person's skill to know it or track down the originator:
http://www.cymru.com/Documents/tracking-spoofed.html

same post at the pg forum- i responded there