OPT_IPV6CP
optval(arg->bundle, OPT_IPV6CP));
opt_enable(&bundle, OPT_IPV6CP);
if (add == NEG_ENABLED && opt == OPT_IPV6CP && !probe.ipv6_available) {
"disable|enable", (const void *)OPT_IPV6CP},
if (Enabled(bundle, OPT_IPV6CP)) {