i_ipadm_unplumb_if
ret = i_ipadm_unplumb_if(iph, ifname, af);
status1 = i_ipadm_unplumb_if(iph, ifname, AF_INET6);
status2 = i_ipadm_unplumb_if(iph, ifname, AF_INET);
extern ipadm_status_t i_ipadm_unplumb_if(ipadm_handle_t, const char *,