IPCP_HISADDR_SEEN
sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN|IPCP_MYADDR_SEEN|IPCP_MYADDR_DYN|IPCP_HISADDR_DYN);
if (sp->ipcp.flags & IPCP_HISADDR_SEEN)
sp->ipcp.flags |= IPCP_HISADDR_SEEN;
if ((sp->ipcp.flags & IPCP_HISADDR_SEEN) == 0) {
if ((sp->ipcp.flags & IPCP_HISADDR_DYN) && (sp->ipcp.flags & IPCP_HISADDR_SEEN))