I have a cisco 2611 with OS 12.3.15 and its e0/0 is configured with the ip 192.168.10.1. If i ping normally to hosts in the subnet 192.168.10.0 is ok. but if i use the extend ping with source address like:
ping 192.168.10.5 source loopback 0 then it can not get through. What would cause the problem? The ip routing command wass executed before.
The route print command is to be executed on the host. It will show what the host thinks it has for routing information. In particular it would be interesting to know if the host had a particular route for that address or subnet. Also to verify what the default gateway on the host is.
It seems to me to be quite strange that the host can ping the loopback address but that extended ping specifying the loopback as source fails. In my experience most of the time when extended ping fails it is an indication that the target device does not have a route to get back to that address. But if the host can ping it, then the host must have a route to it.
I am wondering if there might be an access list configured on the interface. Would you be able to post the configuration of the LAN unterface, the configuration of the loopback interface, and would you be able to try the extended ping again, capture and post the commands that you issue and the responses that the router gives.
Normally would use a /32 mask for the loopback , something to try to see if get any different results. If you look at the route table it is summarizeing it at the /24 boundary , the route table should show the whole address with a mask of 255.255.255.255 . Try giving it a loopback og 192.168.1.1 255.255.255.255 .
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