Do router serial Interfaces on a private wan link have to be In the same subnet ?

[Reprovoid]

I'm new to this so forgive my Ignorance!
  For example.  Router 1 s0/0 has an address of 192.168.10.1/24.Does Router 2 have to have an address between 192.168.2-254 ?
  I thought that Serial Interfaces could be on different subnets and still communicate but I've encountered a question Implying that they must be on

  the same subnet.

  Thank you.

[marcusauman]

The point to point link needs to be on the same subnet to communicate and route properly.

Recommend using a /30

Example.

R1 - S1/0 - 192.168.10.1 255.255.255.252

R2 - S1/0 - 192.168.10.2 255.255.255.252

[cadet alain · Accepted solution]

Hi,

with PPP you could have both ends on 2 different subnets and it would work provided you didn't remove the peer neighbour route from router.This way you could use the ip unnumbered command on the interface to take the ip address from another interface.

Alain.

[Reprovoid]

Hi.What do you mean by the peer neighbour route ?

[cadet alain]

Hi,

you're sending the neighbour a /32 route, that's what it is.

Alain.

[Reprovoid]

Ok , thanks.I've managed to tick the right correct answer box this time!