Alright, my Linux firewall shows an inordinate amount of portscans, and unwanted connections to my machine at home.
This is no doubt, laregly due to the 24 hour IP refresh cycle. Imagine it. Your neighbour runs some kind of P2P software such as Kazaa, or Gnutella.
Within 24hours, he becomes a 'super' node, and his IP adress gets cached in numerous listings, and p2p websites.
Now, come the next day, he drops his old IP and YOU the sucker, gets his fresh IP.
What do you see? A torrent of unwanted TCP, and in some cases UDP connections to the IP address that you just "inherited" from him. I see this happening on a daily basis. It sometimes lasts for hours...
I didn't ASK for that traffic. I inherited it, due to Telkom's forced IP refresh policy.
YET THAT DATA I DIDN'T WANT TO RECEIVE CONTRIBUTES TOWARDS MY CAP...
Look, I'm actually quite happy with my ADSL service. For me, it's been usable interenet for the first time in my life. But the finer details of their ridiculous arrangements leave me fuming sometimes.