Route 2 Lans Together With Cisco 2600 Router

Posted on 2006-06-23
Last Modified: 2013-11-29
Is it possible to route 2 Lans together just using one router with 2 Lan interfaces..  I have a Cisco 2600 Router, LAN A is setup as 192.168.1.x  LAN B is setup as 192.168.0.x.  From network A i am able to ping the LAN A interface on the routers, as well as the LAN B interface on the router, but am not able to get to any computers, or devices on the LAN B network.  Any suggestions would be much appreciated.  Below is a copy of the config.

ip subnet-zero
interface FastEthernet0/0
 ip address
 no ip directed-broadcast
interface Serial0/0
 no ip address
 no ip directed-broadcast
 no ip mroute-cache
interface FastEthernet0/1
 ip address
 no ip directed-broadcast
ip classless
no ip http server
line con 0
 transport input none
line aux 0
line vty 0 4
 password ******
Question by:shigh01
LVL 30

Expert Comment

ID: 16970848
In TCP IP in both A and B
provide default gateway That should be in your case

and prefered dns

Try it

LVL 30

Expert Comment

ID: 16970857
Also check whether firewalls are not blocking access

1. windows firewall

2.  any other firewalls ( norton) etc


Accepted Solution

NYtechGuy earned 500 total points
ID: 16970879

Yes, you are definitely able to what you are asking.

The problem lies with the default gateway on the device you are trying to ping.  Is the router's interface the default gateway for all devices on each network?  That is essential for communication between devices on the different networks.  I suspect that the devices on one of the networks is using a different default g/w (to get to the internet?)

Alternately, you can add an IP route in the OS to point packets bound for the other network to a different IP then the default gateway.

In windows:
    > route ADD MASK METRIC 3 IF 2
             destination^      ^mask      ^gateway     metric^    ^
      If IF is not given, it tries to find the best interface for a given

example (in your case):

route add mask
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LVL 30

Expert Comment

ID: 16970953
If the above solution of my doesnt work

Okay one more thing i noticed Lan B ip should be subnet
and default gateway


Author Comment

ID: 16971698
That was the problem, I talked to the other Admin at the Other Office and he had a default route that he was not telling me about at all.  So that was the problem, i didn't even think about it.  Thanks all for the quick responses and info.  
LVL 13

Expert Comment

ID: 16971736
All you need to do is to configure each machine on network A with default gateway
On network B default gateway should be

Then add the ip routes.

ip route
ip route

That about it, router will do the rest.


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