Well, I just wrote the IPv6 support for Net::IRC yesterday since I noticed that it couldn't handle privmsgs from IPv6 users. I don't know if it will work if you use IPv6 yourself, but it's a beginning. I didn't send it to the developers yet but I propably will. Anyways, here it is:

#remove this code from /usr/lib/perl5/site_perl/5.005/Net/IRC/Connecti
+on.pm:
# this is line 1103 in version 1.3 (1999/08/12)
# --SNIPP--
# REPLACE THIS:
# $line = substr $line, 1 if $line =~ /^:/;
# ($from, $line) = split ":", $line, 2;
# ($from, $type, @stuff) = split /\s+/, $from;
# WITH:
  ($from, $type, $line) = $line =~ /^:?(\S+)\s+(\S+).+?:(.+)$/;
# --SNAPP--
[download]

Hope it helps :) It looks way too simple but it works just fine..
Regards