Rick DeNatale wrote:
I don't claim to be an expert, but I think that there is a basic
misconception about the relationship between sockets and interfaces
here. As I understand it a socket represents an end point. An
interface is a connection to the outside. If there are multiple
interfaces, it's perfectly possible for packets to flow to and from a
given socket through different interfaces. In otherwords, there is a
little network routing "cloud" between the socket and the interface
inside the network stack within the OS. While it's possible to bind
certain types of sockets to particular interfaces, it's not normally
done.
If I'm wrong here correct me, I'm here to learn.
You're entirely correct, but most hosts have one default route and one
interface that that route can take, and in this case it's assumed that
is the goal - to find which. If this were a multihomed router, routes
change often and packets may not always go out the same interface.
Here it is assumed that there are fixed, single routes out each
interface and an additional default route which picks one and only one
outbound interface.
Michael Tharp
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