for my $line(
            map  { $_->[2] }
            sort {
                     $a->[0] cmp $b->[0]
                             ||
                     $a->[1] <=> $b->[1]
            }
            map  {
                    my @vals = split /\s/, $_;
                    my( $sourceserv, $sourceport ) = (split /:/, $vals[0])[0,1];
                    my( $destserv, $destport )  = (split /:/, $vals[2])[0,1];
                    my( $low, $high ) =
                      sort { $a cmp $b }
                      ( "$sourceserv:$sourceport", "$destserv:$destport" );
                    my( $key ) = $low . '-' . $high;
                    [ $key, $sourceport , $_ ]
            }
            <DATA> ){
  print $line;
}