Frame Relay - IP addressing

Christopher Dobkowski

Hi there everyone!

I'm just wondering... If you have multipoint frame-relay configuration (3 routers connected over frame-relay switch) do you need to have IP's in the same subnet on serial interfaces of the routers? I believe yes, but correct me if I'm wrong.
For example, in pint-to-point ppp you do not need to have IP's in the same subnet on both directly connected interfaces.

Thanks in advance!

johnifanx98

Christopher Dobkowski wrote: »

Hi there everyone!

I'm just wondering... If you have multipoint frame-relay configuration (3 routers connected over frame-relay switch) do you need to have IP's in the same subnet on serial interfaces of the routers? I believe yes, but correct me if I'm wrong.
For example, in pint-to-point ppp you do not need to have IP's in the same subnet on both directly connected interfaces.

Thanks in advance!

If the two in a ppp connection are not in the same subnet, would it be a problem for the router to determine the network interface based on the next hop ip when forwarding a packet?

Christopher Dobkowski

Nope, they're point-to-point and are using PPP encapsulation and that does not obligate u to have IP in the same subnet for them to communicate. I think it's because ur using RARP instead of ARP.. Correct me if I'm wrong

Zartanasaurus

johnifanx98 wrote: »

If the two in a ppp connection are not in the same subnet, would it be a problem for the router to determine the network interface based on the next hop ip when forwarding a packet?

By default, PPP negotiates a host route to its neighbor. After the PPP link comes up, you can do a show ip route connected and you'll see it.