> I've a configuration here where one of my interfaces has 2
> ip-addresses (added by "ip addr add ...").  Now I'm running a
> proprietary license-daemon (no source available here) that
> should respond to request to that additional address.  The
> license-daemon will receive the requests (UDP-packets), but
> any answer is sent out with the wrong source-address!!

It is not the wrong source address.

That is one way it is supposed to work if the application gives
the kernel '0.0.0.0' as the binding address, or if it is given
the interface name and it probes it for an address.

Depending on how the application is written you may want to
create a dummy interface for the prescribed address, or to use
the old 'name:number' (as in 'eth0:0') way of attaching multiple
IP addresses to the same physical interface.

Unless the application allows specifying explicitly a binding
address.

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