IP (tos 0x0, ttl 64, id 0, offset 0, flags [none], proto UDP (17), length 68, bad cksum 0 (->4623)!)
    132.213.238.7.500 > 192.168.1.1.500: isakmp 1.0 msgid 00000000: phase 1 I inf:
    (n: doi=ipsec proto=isakmp type=INVALID-MAJOR-VERSION)
