How do we determine IP Address of interface the packet arrived on

[Valdis.Kletnieks at vt.edu]

On Wed, 24 Sep 2014 10:19:34 +0530, Maninder Singh said:
> Hi,
>
> Each time a packet arrives at a router in a subnet during transit, I
> need to determine the IP address of the incoming interface of the
> router for that packet.

What problem are you trying to solve using the IP address of the interface,
given that a single interface can have multiple IP addresses?

(Also - are your writing your code to be IPv6-ready? :)
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