(eth src=00:11:22:33:44:55 type=0x0800
 (ipv4 ttl=64 src=90.0.0.3 dst=90.0.0.2 prot = 47
  (gre key=0x12345678 seq=0xaaaaaaaa
   (ipv4 ttl=64 src=10.0.0.3 dst=10.0.0.2 prot = 17
    (udp (payload pattern=0 length=8))))))