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Originally Posted by downquark1
I thought ISP's tried to block p2p ports, but then they adapted by using a variable port system.
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P2P programs do use variable ports. They have done ever since Napster was launched. It just means p2p programs can be a bugger to block at the firewall (we tried where I work). The only way to totally block them and still allow web access is to block every port apart from 21, 80 and whatever ports email uses. Mind you, even active FTP gets screwed up if you do this (although passive FTP works).
The sad thing is, because of a rise in P2P usage, I think that flat rate broadband will be history, and the easiest thing for the companies to charge for would be data per Megabyte (or Gigabyte).