That's kind of the problem Symon. The problem is that network 10 exists on
both sides of the serial connection.
10.0.1.1 172.16.1.1 172.16.1.2 10.0.2.1
E0 S0 S0 E0
R1 R2
---------- ------------------- ----------
Network 10 Network 172 Network 10
Ethernet Serial Ethernet
What you have is a discontiguous network with Network 10. You can't have
that with a classful routing protocol. That's basic CCNA-level network
theory. If your instructor was unable to understand why you couldn't ping
the interfaces properly, I'd have strong reservations about their overall
ability to teach an advanced networking course.
If you're at R1, you're unable to ping R2's Ethernet interface because
network 10 is directly connected. It sends the ping out the E0 interface
rather than routing it across the serial connection to R2. If you're at R2,
you're unable to ping R1's Ethernet interface because network 10 is directly
connected. It sends the ping out the E0 interface rather than routing it
across the serial connection to R2.
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
> Symon Thurlow
> Sent: Thursday, September 06, 2001 9:40 AM
> To: [EMAIL PROTECTED]
> Subject: RE: 2600 routers and 10.0.0.0/8 networks [7:18786]
>
>
> Rip is classful. This means that it would not know how to propogate your
> 10.0.1-15.0 networks. It would advertise 10.0.0.0/8.
>
> Symon
>
>
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
> Matt
> Sent: 06 September 2001 13:52
> To: [EMAIL PROTECTED]
> Subject: 2600 routers and 10.0.0.0/8 networks [7:18786]
>
>
> I was recently in a CCNP lab where we were to configure 15 new out of the
> box 2600 series routers to get used to the new hardware using
> direct serial
> connections between them (s0/0 & s0/1) using the networks 172.168.1-15.0.
> Each router had a fast ethernet connection (f0/0) which we hooked
> to our PCs
> using the networks 10.0.1-15.0. We were using RIP and everything
> seemed to
> be working fine. We could ping each serial interface from the routers and
> the PCs, but when we tried to ping the ethernet ports, it would not work.
> (We were supposed to setup ACLs on the ethernet to stop icmp, but
> we had to
> get them to work in the first place!). We looked at every router and saw
> nothing wrong in their config. We noticed that the 10.0.0.0/8
> networks were
> not in the RIP updates, so we checked some more and then tried using IGRP.
> Still nothing. I know that 10.0.0.0/8 network is a private
> network, but so
> is the 172.168.0.0/12 network we were using. We ended up changing the
> network on the fast ethernet and we got RIP updates from the new networks
> and everything worked. Does any one know why this would happen.
> Why would
> the 10.0.0.0/8 network not work but the other private network IPs work?
>
> -Matt
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=18820&t=18786
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