Problem pinging across the network

[Sniffer2112]

**I'm trying to get computerA to be able to ping computerB**

Set up:
computerA - switchA - routerA - routerC - routerB - switchB - computerB

Each switch has a Vlan set up... vlanA...vlanB

The three routers are connected via serial WIC-1Ts. I do have static routing on each router for all networks.

If I am on routerA, I can ping all the way to vlanB and computerB.
If I am on routerB, I can ping all the way to vlanA but not computerA.
If I am on computerA, I can ping to routerA(gateway) but can not ping to the serial IP address that goes to routerC.

My thought is that somewhere in switchA there is the issue.

switchA is connected at FA0/7(computerA) and at FA0/24(routerA).
By doing switchA#show ip interface brief....
Interface IP Address OK? Method Status Protocol
FA 0/7 unassigned YES unsent up up
FA 0/24 unassigned YES unsent up up

I'm guessing that it's the IP address being "unassigned". I'm still very new to this but quickly learning.

If you need more information, just let me know and I'll post it.

 

[lerdalt]

Sniffer, the reason we all question the use of the /23 mask everywhere, is even though Cisco recommends no more than 512 addresses per subnet, doesn't mean you need to waste 508 addresses on a point to point connection between 2 routers. Typically in the real world you aren't going to see more than a /30 on a connection between routers.

Imagine if a large corporation used a /23 everywhere...how long before they run out of available subnets to use places.

Since it's a lab for testing/practice, I wouldn't worry about it too much, but it does also give you some better subnetting practice if you break it down. In fact, as a test for you, see if you can do that entire network/design with this address range:
10.0.0.0/24

One tip...and this has messed me up too, having that second nic in your computer is handy, but it can add problems with lab work. Either take it out, disconnect it, or add a route to windows for your lab subnet range with a /8 mask.

 

[Sniffer2112]

Thanks for the input guys. Good to know about the subnet masks. Should be a good practice to change it now and then to keep up the subnetting skills.

I think I'll just hook up computerA to the home internet when I need to look something up really quick and then unplug it. But I guess it brings up a question for me about bridging the two networks. But that's for another time as the CCENT exam is coming up. Part 2 later!!

Thanks for everyone's input!! I hope this helps others.

 

[burtsbees]

10.0.8.0 and 10.0.9.0 would be in the same subnet with a 23 bit mask, but then I looked again at your static routes---thought that both were in the same subnet, but the routes are still the same...

Burt