understanding RIP 1 & 2

[alliasneo1]

Hi, I posted this on another forum but I'm still a bit confused.

I'm a little confused over RIP vs RIPv2.

I have read over and over but can't find a definitive answer in any of the books I'm reading.

My question is, what routes does RIPv1 route too? I've included a sample of my lab - which I hope everyone can see. If RIP is classful and I'm using 168.15 then RIPv1 automatically thinks 255.255.0.0 right?

But if I've subnetted down like I have to .252 to only allow 2 numbers per network on the serial interfaces, how does this affect routing? I'm just trying to see why version 1 is limited to such a degree? I can't quite see the reasoning behind the routing?

So if I had another network off of R2 with the same network 168.15 but on a different subnet number would the routing not work for packets that get to it? Would they be forwarded out the serial interface going to R1 as well as the other network?

-I hope this is clear.

thanks

[alliasneo1]

I've revised my network slightly and added a 150.150.1.0 network with a /24 mask.

Now RIPv1 sends 150.150.0.0 - because it is auto summarising it for a class B?

So Router 3 receives this update, adds it to the routing table and thinks it can reach the whole 150.150 network?

However, when R3 tries to ping one of these networks it gets back to R1 and R1 drops it? I got a u.u.u as R3 thinks it has the route but R2 doesn't.

Any of this correct?

This is what my debug looks like from R1:

RIP: sending  v1 update to 255.255.255.255 via Serial0/0 (168.15.240.254)

RIP: build update entries

      network 150.150.0.0 metric 1

      network 168.15.240.244 metric 1