Реферат: Алгоритми маршрутизації в мережах

#endif

&& !(ifp->int_state & IS_ALIAS)) {

m.imr_multiaddr.s_addr = htonl(INADDR_RIP_GROUP);

m.imr_interface.s_addr = ((ifp->int_if_flags & IFF_POINTOPOINT)

? ifp->int_dstaddr

: ifp->int_addr);

if (setsockopt(rip_sock,IPPROTO_IP, IP_ADD_MEMBERSHIP,

&m, sizeof(m)) < 0)

LOGERR("setsockopt(IP_ADD_MEMBERSHIP RIP)");

}

}

/* Prepare socket used for RIP.

*/

void

rip_on(struct interface *ifp)

{

/* If the main RIP socket is already alive, only start receiving

* multicasts for this interface.

*/

if (rip_sock >= 0) {

if (ifp != 0)

rip_mcast_on(ifp);

return;

}

/* If the main RIP socket is off and it makes sense to turn it on,

* then turn it on for all of the interfaces.

*/

if (rip_interfaces > 0 && !rdisc_ok) {

trace_act("turn on RIP");