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RFC 2811: Internet Relay Chat: Channel management

5.2.3 Abuse Window


   Because the periodicity is so long, attacks on a particular channel
   (name) may only occur once in a very long while.  However, with luck
   and patience, it is still possible for a user to cause a channel
   collision.  In order to avoid this, servers MUST "look in the future"
   and keep a list of channel names which identifier is about to be used
   (in the coming few days for example). Such list should remain small,
   not be a burden for servers to maintain and be used to avoid channel
   collisions by preventing the re-creation of such channel for a longer
   period of time than channel delay does.

   Eventually a server MAY choose to extend this procedure to forbid
   creation of channels with the same shortname only (then ignoring the
   channel identifier).




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