There is a good reason why you are seeing what you are. When you ping a network address, the router will convert the destination address to be 255.255.255.255 (the local broadcast). It does that even though you entered a specific network address. The reasoning behind this is that you are attempting to ping the whole network and the best way to do that is to send a local broadcast. Now, every device on that LAN segment will receive the ping addressed to 255.255.255.255 and respond to it. That is why you receive a reply from a different address to what you actually pinged. If you had more devices on the LAN, you would receive replies from all of them.
My experience is that this explanation of the router forwarding the ping to the network address as a local broadcast is correct if the router is configured with ip directed-braodcast. If the router is configured with no ip directed-broadcast then the router will not forward the ping as a local broadcast. In either case I have experienced that the router will generate a response to the ping request.
ip directed-broadcast used to be enabled by default. Then Cisco changed the default and now the default is to disable directed-broadcast. The reason for the change is that directed-broadcast is used by some denial of service attacks.
Just a clarification to Rick's post. The 'ip directed-broadcast' capability only comes into play when the directed broadcast originates on a router other than the one that is directly connected to the destination network. For the router that *is* connected to the destination network, the 'ip directed-broadcast' command has no effect. Therefore, if you ping 10.1.1.0 or 10.1.1.255 from the router to which the network 10.1.1.0/24 is connected, it will exploded into a local broadcast, regardless of how you have configured the 'ip directed-broadcast' command.
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.