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#!/usr/bin/perl -w
use strict;
...
    $ip->{'src_ip'}, ":", $tcp->{'src_port'}, " -> ",
    $ip->{'dest_ip'}, ":", $tcp->{'dest_port'}, "\n";
}

Use of uninitialized value in unpack at /usr/lib/perl5/site_perl/5.8.0
+/NetPacket/TCP.pm line 138.
57.24.4.3:260 -> 0.0.100.0:33412
...
3.37.90.0:0 -> 0.0.100.0:5
5.37.90.0:0 -> 0.0.100.0:5
3.0.0.0:1 -> 8.6.0.1:2560