[lwip-devel] [bug #31367] Cannot send a UDP datagram to a different valid subnet

[Bill Auerbach]

Follow-up Comment #7, bug #31367 (project lwip):

>As to the ARP entry: I don't remember why, but there's a reason
>that entry isn't made. It's somewhere in the RFCs and I think it
>was to prevent the device having flood its ARP table

I see no reference to this after about an hour searching.  What I did see
reference to: We  might have a lot larger risk of spoofed ARP requests and ARP
floods causing problems than we do from trying to cache incoming broadcasts.

>If we had 1000 devices on a subnet and added an ARP entry for 
>every broadcast, the ARP cache would grow very big very fast.

This also assumes every device broadcasts.  Perhaps the ARP entry can be
delayed on a broadcast until it's known if a callback is going to handle it. 
If no one handles it, there will be no outgoing data and nothing to cache.  If
a callback is used for the broadcast packet, then an ARP entry created at that
time would allow the callback to reply and have it get out.

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