CONF_NAK
case CONF_NAK:
if (h->type == CONF_NAK)
sppp_cp_send(sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf);
sppp_cp_send (sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf);
type = CONF_NAK;
case CONF_NAK: return "conf-nak";