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  1. or download this
    $ tcpdump -d tcp
(000) ldh      [12]
...
(006) jeq      #0x6             jt 7    jf 8
(007) ret      #96
(008) ret      #0
  2. or download this
    use constant IPv4 => 0x0800; # Regular TCP/IP
use constant IPv6 => 0x86dd; # New and improved!
...
  return 1 if $proto == TCP;
  return;
}