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Webcast-Catalyst9k
New Member

routing problem

Hi Netpros,

I have a Catalyst 4510 L3 swtich (192.168.212.1) and are using static routes, I have no default route configured.

My problems is this - i have a directly connected 10.100.100.0 /24 network and I need to add a static route to 10.118.13.0 /24 network via 172.168.8.2 The routing table shows the following :

10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C 10.100.100.0/24 is directly connected, Vlan10

S 10.118.13.30/32 [1/0] via 172.16.8.1

the static route has been entered as ip route 10.118.13.0 255.255.255.0 172.16.8.1

When I ping from the Catalyst switch to network 10.118.13.0 It works fine, however when I ping from the 10.118.13.0 network to 192.168.212.0 network (Catalyst switch) I get TTL expired messages - its like I have a routing loop and the cause of the problme I think is becuase of the directly connected 10.100.100.0/24 route?????

I could be wrong - any takers on trying to figure this one out with me?

thanks.

rod

1 ACCEPTED SOLUTION

Accepted Solutions
Cisco Employee

Re: routing problem

Hi Rod,

I don't think there is any relation between VLAN 10 and your issue.

You need to make a hop by hop routing table check starting from the host on 10.118.13.0 subnet:

- You check the routing table to find the outgoing interface to join 192.168.212.1.

- If the nexthop is the expected one, do the same check on the nexthop up to the destination.

This way you should find a wrong entry on a router along the path.

You can also do a traceroute from the host.

HTH

Laurent.

2 REPLIES
Cisco Employee

Re: routing problem

Hi Rod,

I don't think there is any relation between VLAN 10 and your issue.

You need to make a hop by hop routing table check starting from the host on 10.118.13.0 subnet:

- You check the routing table to find the outgoing interface to join 192.168.212.1.

- If the nexthop is the expected one, do the same check on the nexthop up to the destination.

This way you should find a wrong entry on a router along the path.

You can also do a traceroute from the host.

HTH

Laurent.

New Member

Re: routing problem

Thanks Laurent, by looking at the basics (routing tables) I was able to reslove my problems.

One of my hops on the way didn't have a route to the 192.168.212.0 network - although I could have swore blind I added it !!

thanks.

rod

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