CONFIG_IP_NF_IRC
CuSeeMe protocol support
CONFIG_IP_NF_CUSEEME
  The CuSeeMe conferencing protocol is problematic when used in
  conjunction with NAT; even though there are no random ports used for
  extra connections, the messages contain IP addresses inside them.
  This NAT helper mangles the IP address inside packets so both
  parties don't get confused.

  If you want to compile it as a module, say M here and read
  <file:Documentation/modules.txt>.  If unsure, say `Y'.
