Unable to Ping from Remote Network 1

[airbourne]

Ok, this is probably an easy question, but since I am just starting out, I need help.

I have 2 networks connected via a point-to-point. Communication works perfectly across this point to point.

The point to point has a Cisco 1701 router on each end. I can ping both of those flawlessly. In each network there exists a non-firewalled Cisco 1701. Drawn like this:

LAN1
10.12.10.248/24(router)
10.12.10.253/24(router)10.254.254.5/24

T1- P2P

10.254.254.6/24(router)10.10.10.251/24
(router)10.10.10.248/24
LAN2

I can ping either of the Point to point routers from a host on either network. However, I can only ping the 248 interfaces if I am on the network local to them. I can ping any host on the remote network, but I cannot ping the 248 from the remote network. What command is being implemented on what router to stop remote ping requests from getting through and what is the point of implementing this way? I can not see any reason why I should not be able to ping any address on any of my networks from any of my networks.

 

[dearingkr]

I've seen this many times.
You probably have PC's default gateway set to 10.12.10.248 on LAN1 and 10.10.10.248 on LAN2. The routers aren't talking to each other.

You'll need to do one of 2 things:

1. Configure all routers with a routing protocol, i.e. RIP, OSPF, EIGRP, etc.
If you've got all Cisco, EIGRP is easy to set up.
All the following lines to ALL 4 routers:

router eigrp 10
  network 10.0.0.0 0.255.255.255
  no auto-summary

2. Configure all routers with static routes.
For exmaple, LAN1 router 10.12.10.248:

ip route 10.10.10.0 255.255.255.0 10.12.10.253

Hope this helps.

MCSE CCNA CCDA

 

[airbourne]

OMG, I can't believe I missed that. The default route on the router I am trying to ping is:

ip route 0.0.0.0 0.0.0.0 10.17.17.254

Which, coincidentally is the other way. You are right. Thank you for catching that! I think I can setup a static route to resolve this problem the easiest.