On Fri, Apr 20, 2012 at 11:04:29AM -0700, Dennis Ferguson wrote: > Note, though, that even if NetBSD did implement a strong-ES model it still > wouldn't send the packet out the bge0 interface; it would drop it instead. Yep. Contrast, though, with binding a listening socket, and sending reply packets in such a model. From rough memory, I think they are required to leave the same interface the original packets arrived on. Regardless od speculation on unimplemented features, though.. > Given this, I would argue that all bind()ing a local address to a socket does > for > outbound packets is to override the kernel's most-likely-to-succeed selection > of > a local address with one of your own choosing. Multicast is a good illustration here: your packet may indeed even leave on multiple interfaces, and you often want to expicitly select an official address (such as a routed loopback or public address you want replies directed to) as the source. -- Dan.
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