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

[Ivan Delamer]

Follow-up Comment #3, bug #36403 (project lwip):

Maybe we need to consider a change to ip_route() and ip6_route() so that we
try responding on the input netif if possible.

I have cases with two netifs, e.g. WLAN and GPRS modem. I have requests coming
in GPRS and sometimes reponses are sent back on WLAN because it is listed
first.

I'll have to make a note to look into it a bit more.

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