[lwip-devel] [bug #36403] ip4_input() and ip6_input() always pass inp to higher layers

[Simon Goldschmidt]

Follow-up Comment #1, bug #36403 (project lwip):

> Intuitively I think we should be passing the accepted netif

For "simple" applications, I think so, too.

> but keeping a reference to inp means we can send response packets on the
same netif that we received data

I think you can argue about that: from testing at work, I know that at least
Windows XP sends out packets to the normal route, no matter where a packet has
been received (yes, also ICMP responses).

So while the logical thing to do would be to respond on 'inp', I think that
responding on the accepting netif would be just as good: if the caller delays
its response, the accepting netif would be used anyway!

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