MAC_PLUGIN_IDENT_IPV4
{ IPTUN_TYPE_IPV4, MAC_PLUGIN_IDENT_IPV4, IPV4_VERSION,
mtrp->mtr_ident = MAC_PLUGIN_IDENT_IPV4;
(void) mactype_unregister(MAC_PLUGIN_IDENT_IPV4);
if ((err = mactype_unregister(MAC_PLUGIN_IDENT_IPV4)) != 0)