Subnet Confusion

[datadan]

I am confused about subnets and subnet masks.

I have 7 locations that I have inherited and I suspect that things are not as they should be.
10.11.10.x 255.255.0.0 (gw of last resort = 10.11.10.2)
10.10.10.x 255.255.255.0 (gw of last resort = 10.10.10.2)
10.60.40.x 255.255.0.0 (gw of last resort = 10.60.40.2)
10.10.12.x 255.255.255.0 (gw of last resort = 10.10.12.2)
10.50.10.x 255.255.0.0 (gw of last resort = 10.50.10.2)
10.60.30.x 255.255.255.0 (gw of last resort = 10.60.30.2)
10.60.20.x 255.255.0.0 (gw of last resort = 10.60.20.2)

All sites homerun back to 10.10.10.x for app server and mail server.

All sites have their own internet access (the .2 gw of last resort).

All sites connected via a mix of T1/Frame Relay/VPN connections.

First Question:
How should the subnets look? Switching from class b to class c seems odd to me.


Second Queston:
I can't ping to or telnet to some devices when in another subnet. Is this a subnet problem or a wacky network configuration problem.

From 10.10.10.10 (router) to 10.11.10.7 (file server at different location) = no problem for ping/telnet.

From 10.10.10.10 (cisco router) to 10.11.10.10 (cisco router) no problem.

From 10.10.10.10 (cisco router) to 10.11.10.2 (dsl router) = no reply.




Thanks for your advice

 

[Serbtastic]

Your 10.60 locations are incorrect:

10.60.40.x 255.255.0.0 (gw of last resort = 10.60.40.2)
10.60.20.x 255.255.0.0 (gw of last resort = 10.60.20.2)

These 2 are on the same network, so the routers won't route between the 2 unless there is a static routing rule in place.

Also, the above 2 locations will see this one:

10.60.30.x 255.255.255.0 (gw of last resort = 10.60.30.2)

as a local subnet, and won't route to it without a static routing rule.

Where are the cisco router (10.11.10.10) and dsl router (10.11.10.2) in relation to each other on the network? Is the cisco your border router?

 

[datadan]

O if I could only draw a picture:

1) e/0 10.10.10.10 (cisco router gateway)
e/1 10.10.12.253
2) 10.11.10.10 (cisco router gateway)
3) 10.10.12.2 (cisco router gateway)
4) 10.60.40.1 (cisco router gateway)

1 & 2 connected via point to point T1 EIGRP.
1 & 4 connected via frame EIGRP
1 & 3 in the same building plugged into same switch

DSL router for 1 is on 10.10.10 subnet in building A.
DSL router for 2 is on 10.11.10 subnet in building B.

What is a boarder router?

 

[dearingkr]

Unless you have 250 devices in one location, all your subnets should be class C (255.255.255.0).

The key to communication between locations is a properly configured router protocol and making sure all default gateways are correct.

Looks like you're using EIGRP as your routing protocol. This is fine unless you have non-Cisco network equipment.
If you do, I would advise using OSPF, RIP, or static routes.

It's difficult to recommend anything else without seeing your layout.

I'd be happy to take a look at your diagrams if you want more info. Post back here and let me know.