Apparently, IF_UNICAST_IF does not influence the routing decisions done during connect(). But SO_BINDTODEVICE/SO_BINDTOINDEX does, which however brings a lot of other semantics with it, we are not so interested in (i.e. it doesn't not allow packets from any other iface to us, even if routing otherwise allows it). Hence, let's bind to the ifindex immediately before the connect() and unbind right after again, so that we get the semantics we want, but not the ones we don't. Fixes: #11935 Replaces: #12004
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