(eth
 (ipv4 dst=10.0.0.2 src=20.0.0.2 
  id=2 prot = 47 csum=0
  (gre key=0xcafecafe seq=0xaaaaaaaa
   (ipv4 ttl=64 dst=10.0.0.1 src=20.0.0.2 tos=0x02
    id=2 prot = 17 csum=0
    (udp (payload pattern=0 length=638))))))
(eth type = 0x86dd
 (ipv6 nh=47
  (gre key=0x12345678 seq=0xaaaaaaaa
   (ipv4 ttl=64 dst=10.0.0.1 src=20.0.0.2 tos=0x02
    id=2 prot = 47 csum=0
    (gre key=0 seq = 0
     (ipv4 ttl=64 dst=10.0.0.1 src=20.0.0.2 tos=0x02
      id=2 prot = 17 csum=0
      (udp (payload pattern=0 length=638))))))))
(eth
 (ipv4 dst=10.0.0.1 src=20.0.0.2 tos=0x03
  id=2 prot = 17 csum=0
  (udp (payload pattern=0 length=638))))