How to trace the source of a ip packet?

On a router,how can I know the interface which a packet come in(I know the source ip address of the packet)?I use access-list and log to do it,but it's a slow method.Can I use debug or something to do it?
thank you!

You can use the 'debug ip packet' command. Please be careful with this command on heavly loaded routers tough.
The best practice would be to create a standard access-list with 'access-list 73 permit 10.0.0.1 0.0.0.0' or whatever ip address /subnet you want to track. Use this list in the debug command, 'debug ip packet 73' to narrow down the debug information....
/M

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