DEFINE_FIELD_M(NX_IPV6_DST, MFF_IPV6_DST, false)
DEFINE_FIELD (NX_IPV6_LABEL, MFF_IPV6_LABEL,false)
DEFINE_FIELD (NX_IP_ECN, MFF_IP_ECN, true)
+DEFINE_FIELD (NX_IP_TTL, MFF_IP_TTL, true)
/* XXX should we have MFF_ICMPV4_TYPE and MFF_ICMPV6_TYPE? */
DEFINE_FIELD (NX_ICMPV6_TYPE,MFF_ICMP_TYPE, false)
DEFINE_FIELD (NX_ICMPV6_CODE,MFF_ICMP_CODE, false)