On Mon Sep 23 08:28:55 2013, jpopelka@redhat.com wrote:
> > => a simple question: is the problem for multicast or
> > unicast packets (it should work for multicast packets
> > but for unicast packets it has no chance to work with
> > a single global socket bound to *.port)?

=> as this is about clients it should be unicast only.
BTW the code was written for a relay or a server or
an unique client (and for Unixes including BSDs and Linux).

> > => I am afraid it will break agents via the multicast receive.
> 
> We already dropped it and have been using the following, i.e. binding to 
> interface even for AF_INET6:

=> SO_BINDTODEVICE is system specific so can't be
a critical part of the solution. BTW I can say the same about
SO_REUSEPORT as when it is implemented SO_REUSEADDR
still detects multiple clients trying to bind() to *,port...

But as we have to support BSDs and Linuxes I am afraid the
only solution is to bind() to the (?) link-local address.