[lwip-devel] [bug #38803] Source address in broadcast ping reply

[Jens Nielsen]

Follow-up Comment #5, bug #38803 (project lwip):

On the other hand, I did some more reading in RFC 1122. This is from 3.2.1.3,
which defines the "specific-destination address" mentioned in the section I
quoted in my original post.

"The specific-destination address is defined to be the destination address in
the IP header unless the header contains a broadcast or multicast address, in
which case the specific-destination is an IP address assigned to the physical
interface on which the datagram arrived."

The behaviour seems odd, but the requirements are clear as far as I can tell..
In the case of broadcast ping we should use the address from "inp" regardless
of which interface the destination address matched. Direct ping should still
use the destination address from the request.

The ip_addr_isbroadcast() check is still done on the wrong interface though.

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