[lwip-devel] [bug #27704] autoip starts with wrong address - ntohl

[Tamas Somogyi]

Follow-up Comment #2, bug #27704 (project lwip):

goldsimon# yes, it always returns 169.254.254.169 on little-endian (e.g. our
TI DSP or Windows) platforms, because the wrong (mirrored) part is kept by the
mask "addr = AUTOIP_NET | (addr & 0xffff);"
This also means that having two or more devices on the network, they all
picks up the same address (169.254.254.169) causing IP address conflict! In
this case "addr += netif->autoip->tried_llipaddr;" doesn't help either,
because the wrong part is masked.
And as AUTOIP_NET is defined as a 32-bit number, the compiler will generate
the correct byte representation both on little and big endian platforms, thus
ntohl() to be removed.

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