To enable IPv6 on the server you need:

  - The Perl module Socket6
    You can install it on Debian or Ubuntu with: 
    apt-get install libsocket6-perl

  - Add to /etc/xinetd.d/fex the line:
  	flags = IPv6
    and remove the "bind" option line.
    Restart xinetd.


To enable IPv6 for fexsend, fexget and sexsend you need:

  - The Perl module Net::INET6Glue::INET_is_INET6
    You can install it on Debian or Ubuntu with: 
    apt-get install libnet-inet6glue-perl
