One that know simply change ISP, I have never switched to cable here in my country because it is in a permanent "firewalled state" (without pubblic IP, if you don't pay an additional fee; it is like a private LAN of cable users when you see it from external internet).
Cable to cable is unfirewalled, cable to normal internet is firewalled; there is also a custom version of eMule for this cable provider.

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Skulls! Multi-Network WebCache