[lwip-devel] [task #6995] Implement SO_REUSEADDR

[Jonathan Larmour]

Follow-up Comment #6, task #6995 (project lwip):

You should be able to bind to 255.255.255.255 - it is meant to have the same
meaning as INADDR_ANY. From the ip(7) manpage on linux:
-=-=-=-=-=-=-=-
       There are several special addresses: INADDR_LOOPBACK (127.0.0.1)
always refers to the local host via the
       loopback device; INADDR_ANY (0.0.0.0) means any address for binding;
INADDR_BROADCAST  (255.255.255.255)
       means any host and has the same effect on bind as INADDR_ANY for
historical reasons.
-=-=-=-=-=-=-=-

In order to send/receive broadcast datagrams, instead in POSIX the
SO_BROADCAST flag is used: 
http://www.opengroup.org/pubs/online/7908799/xns/setsockopt.html

Although that link only says "transmission" and my Linux man page says: "When
enabled, datagram sockets receive packets sent to a broadcast address and they
are allowed to send packets to a broadcast address."

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