routing issue

Unanswered Question
Aug 5th, 2009
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Hi,


I have a network with 3 branches

Branch A - Main Center HQ

Branch B - Main Branch Office

Branch C - Small Branch Office


Branch A connects to Branch B on Router-1

Branch C connects to Branch B on Router-2

both router in Branch B are connected to a Switch on the LAN Side 192.168.10.x network.


192.168.10.2 on Router-1 LAN Int Fa0/0

192.168.10.5 on Router-2 Lan Int Fa 0/0


Branch A and Branch B are connected over OSPF on Router-1. Branch C and Branch B are connected using static route over Router-2.


From Branch A- am able to reach Branch B and Branch C.

From Branch B- am able to reach Branch A and Branch C.

From Branch C- I am not able to see Branch A.


If ping from Branch C Router to Branch B WAN interface (Fa0/1) i am able to ping. I am able to ping the LAN interface (Fa0/0) ie- 192.168.10.5 also, but i am not able to ping the same range IP 192.168.10.2 configured on the Router-1 Lan interface Fa0/0.


Branch C router has a default route pointing to the Branch B Router2 WAN Interface (Fa0/1).


what could be the problem? how can i make this work? a route-map can work or not?

Apreciate your valuable input.


regards

Jacob

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Jon Marshall Wed, 08/05/2009 - 02:26
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Jacob


The obvious thing to check is Router-1 routing table to see if it knows how to get to Branch C.


When you ping from Branch C what is the source IP address and does Router 1 know how to get to this.


Remember you can specify the source address on Branch C router when you ping ie.


ping 192.168.10.2 source


Jon

Jacob Samuel Wed, 08/05/2009 - 02:44
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Hi Jon,


On Router-1 there is a static route for Branch C Local network (192.168.20.x) pointing to the Lan interface (fa0/0)

192.168.10.5 of Router2.


ip rouet 192.168.20.0 255.255.255.0 192.168.10.5


In this case if i Ping from 192.168.20.x or the sourece as 192.168.20.x it should be pinging up to 192.168.10.2 right?


From Branch C router it was not an extended Ping we did, i will check this and update Jon.


But again, if i have to reach the LAN of Branch A, i have to specify a router-map on the Branch B Router2..! am i right?


Thanks and Regards

Jacob

Jon Marshall Wed, 08/05/2009 - 03:09
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Jacob


"From Branch C router it was not an extended Ping we did, i will check this and update Jon."


The Branch C router will use it's WAN interface as the src address by default. Check that router 1 has a route back to this address.


You do not need to use route-maps, this is a simple routing issue unless there is something else you have not explained fully.


Jon

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