struct ipv6_mreq server = {ALL_DHCPV6_SERVERS, iface->ifindex};
setsockopt(sock, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &relay, sizeof(relay));
struct ipv6_mreq server = {ALL_DHCPV6_SERVERS, iface->ifindex};
setsockopt(sock, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &relay, sizeof(relay));