arp is not resolve in back to back router connection

[laksh]

Hi

I have two router router 1 and router 2 and both are connected back to back
but the arp is not getting resolve please let me know where to debug.

 

[Gryz]

It is impossible for us to help you here. We have no idea what brand or type routers you are using. We have no idea about the topology of your network (back to back ? good. but how specifically ?). We don't know how you configured them. We don't know what you're doing. And we don't know what goes wrong exactly.

Usually the problem is a configuration error. You maybe typed the wrong ip prefixes ? Or wrong netmask ? Or you configured the wrong interface ? Or you put the cables in the wrong physical interface ?

If you have routers with CLIs, you can try debuging. E.g. on cisco routers you can do "debug arp" and see the outgoing and incoming packets. On ciscos you can look at CDP (cisco discovery protocols) and see if routers see each other. Only Linux based routers you can use tcpdump. If you have a windows PC connected to the link between your routers you can use WireShark to look which packets go over the wire. (WireShark is free. But you problably need a switch between your 2 routers so you can connect a PC to it too).

Good luck.