I have a network running RIP v2. When the network was originally built, it used IP unnumbered on serial links. The router at each end of the serial link has the serial interface (that uses IP unnumbered) and an ethernet interface that's in class C network in the 10.X.X.X network space. For example, Router A's ethernet interface might be 10.1.0.1/24 and Router B's ethernet interface might be 10.2.0.1/24. The ip unnumbered works perfectly.
Now I need to subnet the address space the the ethernet interface on Router A connects to. For example, I need to take the 10.1.0.0/24 space and subnet it into 10.1.0.0/25 and 10.1.0.128/25. I still want to run ip unnumbered across the serial links (there's a reason for this, honest. It's an unusual network.) Only problem is, now the subnet masks don't match on the ethernet interfaces at both ends of the link.
Can anyone tell me if this setup will still result in the ip unnumbered working across the serial links between Router A and Router B?
yeah, I read this thing and it gave me heartburn. I think that my case is same major net, different subnets but even that is problematic. I figure the major net is the 10.0.0.0 network in my example. The subnets are the 10.1.0.0/24 and 10.2.0.0/24 subnets. In the example that Cisco gives for this, they show the same subnet mask on both networks. I have an old Cisco Press book (circa 1998) that makes a blanket statement that the subnet mask must be the same on both sides for ip unnumbered to work properly. It says this before it even discusses the cases given in the article you cited. After I further subnet one of my networks I no longer have masks of the same length so I'm wondering about this. Have you ever done what I'm asking about and had it work?
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