I'm still having problems with all of this, however I can now post some clearer information on the exact problems...
Our local network is made up of three subnets: 172.16.1.0/16,
172.16.10.0/16, 172.16.11.0/16. The
*majority* of clients live in
172.16.10.0 and 172.16.11.0.
A local router (172.16.1.194/16) connects through a directly-connected T1 to a remote router (172.16.26.1/24) for access to a remote network consisting of 172.16.26.0/24 and 172.16.27.0/24.
Clients that exist locally in 172.16.1.0/16 *can* ping the local router (172.16.1.194/16) and *can* ping the remote router (172.16.26.1/24) via the T1. Clients that exist locally in 172.16.10.0/16 can ping the local router but *CANNOT* ping the remote router, or any other host across the T1.
A traceroute from a machine in the 172.16.10.0/16 network stops at the local router (172.16.1.194/16), so it is clear that it is a routing or addressing issue:
(user@172.16.10.20)$ traceroute -n 172.16.26.1 traceroute to 172.16.26.1 from 172.16.10.20, 64 hops max, 40 byte packets 1 172.16.1.194 3.858 ms 1.200 ms 1.059 ms 2 * * *
Please note that 172.16.1.0, 172.16.10.0 and 172.16.11.0 have a subnet mask of /16 as they are all directly-connected through a Layer-2 switch. No dynamic routing is used in the network. And as has been covered in this thread, the subnet masks are 'incorrect' in terms of
172.16.26 really being remote, and not local.
Local router config:
version 11.3 ! interface Ethernet0/0 ip address 172.16.1.194 255.255.0.0 no ip mroute-cache no mop enabled ! interface Serial0/0 ip address 10.1.2.2 255.0.0.0 no ip mroute-cache no fair-queue ! no ip classless ip route 172.16.25.0 255.255.255.0 10.1.2.1 ip route 172.16.26.0 255.255.255.0 10.1.2.1 ip route 172.16.27.0 255.255.255.0 10.1.2.1 ip route 172.16.28.0 255.255.255.0 10.1.2.1
Remote router config:
version 12.2 ! ip subnet-zero ! interface FastEthernet0/0 ip address 172.16.26.1 255.255.255.0 duplex auto speed auto appletalk cable-range 20000-20000 20000.18 appletalk zone Augusta no cdp enable ! interface Serial0/0 description t1 to irrelevant remote office ip address 10.1.0.1 255.255.255.252 encapsulation ppp ! interface FastEthernet0/1 ip address 172.16.27.1 255.255.255.0 duplex auto speed auto no cdp enable ! interface Serial0/1 description t1 to local router (i.e. the important one) ip address 10.1.2.1 255.255.255.252 no cdp enable ! interface Serial0/2 description t1 to another irrelevant office ip address 10.1.1.1 255.255.255.252 appletalk cable-range 10000-10000 10000.7 appletalk zone WAN no cdp enable ! ip classless ip route 172.16.1.0 255.255.255.0 10.1.2.2 ip route 172.16.3.0 255.255.255.0 10.1.2.2 ip route 172.16.25.0 255.255.255.0 10.1.1.2 ip route 172.16.28.0 255.255.255.0 10.1.0.2 ! call rsvp-sync ! mgcp profile default ! dial-peer cor custom
As you can see, the remote router happens to have a couple of extra T1s that hang off it connecting to other sites; but those aren't relevant to the discussion here.
As always, thanks for your help guys!
Chris I'm not a routing expert, but I play one on T.V.