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How do I get 2 networks to talk to each other over T1 lines using 1720 Cisco routers

Posted on 2003-10-29
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Last Modified: 2010-03-17
I have connected 2 sites A and B using Cisco 1720 routers. I did the easy setup using the Router#configf#setup command and bridged both Fastethernet0 and Serial0 on both A and B. I have made the two router local addresses the gateway.(two gateway for each side because they have DSL routers for internet access, eventually I will eliminate one DSL line and share from site A, but for now I have to get the traffic flowing through for applications)

I can ping the router IPs from both sides for both Fastethernet and serial, But I can not get through to the LANs on both sides. I know this is a simple setup but it has beaten me.

Site A: Fastethernet0 192.168.0.4 255.255.255.0
          Serial0  192.168.155.1 255.255.255.0

Site B: Fastethernet0 192.168.0.4 255.255.255.0
          Serial0  192.168.155.1 255.255.255.0

I have tried IGRP which allows pinging from the workstations up to the opposite router Fastethernet0 address and stops there. Static routing does not even ping.

tracert stops at the Serial0 of the opposite side router. Please help me!!!
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Question by:usaidata
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Expert Comment

by:_tack
ID: 9641354
your setup does not look really good.

You are not allowed to use the same address on the same subnet for two different devices

site A: Serial0:  192.168.155.1
          FastEthernet0 192.168.0.4 255.255.255.0

site B: Serial0: 192.168.155.2
          FastEthernet0 192.168.0.5 255.255.255.0

Try first changing IP on routers and see that they can really ping each other.
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Author Comment

by:usaidata
ID: 9641591
Sorry, The ip on Side B fastethernet0 is  192.168.5.4, and yes I am able to ping the routers from each other. I can also ping the routers from any workstation on both A and B

Thanks
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_tack earned 500 total points
ID: 9641709
Since you have different subnet on the 2 routers, bridging should not work
you should consider routing rules only. (Bridging works when segments are on the same subnet).

Are the IP address on Serial0 interface different ?

try the following:
from wks on site A, ping S0 on router site A
from wks on site A, ping S0 on router site B
from wks on site A, ping FE0 on router site B

does everything work ?
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Author Comment

by:usaidata
ID: 9646629
Thanks, it was my routing. I used eigrp and routed the DSL router that is on Site A through Ser0 on A: IP route 0.0.0.0 0.0.0.0 192.168.0.198

Thanks for the quick response
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