CONFIG_IP_NF_IRC
Amanda protocol support
CONFIG_IP_NF_AMANDA
  If you are running the Amanda backup package (http://www.amanda.org/)
  on this machine or machines that will be MASQUERADED through this
  machine, then you may want to enable this feature.  This allows the
  connection tracking and natting code to allow the sub-channels that
  Amanda requires for communication of the backup data, messages and
  index.

  If you want to compile it as a module, say M here and read
  Documentation/modules.txt.  If unsure, say `N'.