V_nat64ipstealth
if (*V_nat64ipstealth == 0 && ip->ip_ttl <= IPTTLDEC) {
V_nat64ipstealth = &V_ipstealth;
if (*V_nat64ipstealth == 0)
V_nat64ipstealth = V_nat64ip6stealth = &stealth_off;
V_nat64ipstealth = V_nat64ip6stealth = &stealth_on;