[Bug 33008] UDP listening on specific IP address does not work properly

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=33008

--- Comment #7 from Erich Hoover <ehoover at mines.edu> 2013-02-19 14:54:49 CST ---
This sounds like Wine is now properly implementing the behavior that the
application should have under Windows in a similar circumstance.  So, I would
guess that how you're routing the traffic is responsible for Wine dropping the
packet.

However, it is possible that something needs to be done in the packet filter to
address your rather peculiar use case.  What I read of how you're trying to
setup things is that you want it to work like so:
B.B.B.x -> A.A.A.Address -> Wine
If your NAT rule is not changing the source information (I believe that's the
"MASQUERADE" option) then the packet is being dropped because Wine is detecting
that the packet is coming in on the wrong interface.  That is how an
interface-specific bind on Windows is supposed to work.  How Wine used to
behave is to make a Unix-like interface-specific bind (which works differently
than on Windows), which would allow that packet from the wrong interface.  To
operate in a Windows-like way Wine now binds to 0.0.0.0 and uses a Linux Socket
Filter to screen packets that come in to make sure they're on the correct
interface.

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