in6_update_ifa
if ((error = in6_update_ifa(ifp, &ifra, IN6_IFAUPDATE_DADDELAY)) != 0) {
if ((error = in6_update_ifa(ifp, &ifra, 0)) != 0) {
int in6_update_ifa(struct ifnet *, struct in6_aliasreq *, int);