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Find the interface a subnet is going out on a router

Posted on 2013-01-11
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Last Modified: 2013-01-25
I want to know how to find the interface a subnet's traffic is leaving on a router for example:
subnet 192.168.0.0?
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Question by:dsterling
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by:128bits
ID: 38769406
Is it a consumer grade, i.e. home router or is it cisco, juniper etc router?
If it's a cisco router you can do:

show ip route 192.168.0.0

and it will show you the outgoing interface and ip address of the next hop
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rauenpc earned 500 total points
ID: 38769421
If the above command responds with "subnet does not exist" use the command
Show ip route 192.168.0.0 255.255.255.0 longer-prefix

Substitute network and mask with whatever you're looking for. If there are no routes, it will show you your gateway of last resort.
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by:dsterling
ID: 38769439
Comments are great, but I don't see a route and it's not showing the gateway of last resort, could that be the gateway of last resort is not set? It does have a default-gateway IP?
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Expert Comment

by:rochey2009
ID: 38769594
Hi,

Which router do you have?
Is ip routing enabled?
Please can you post a sanitised version of the configuration.
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Expert Comment

by:rauenpc
ID: 38770070
Normally the default-gateway command is only used if a router is only being used as a bridge.
ip route 0.0.0.0 0.0.0.0 1.1.1.1
Is the normal method to set the default gateway where 1.1.1.1 is the gateway to the rest of the network/internet.
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