[TriLUG] C & sockets programming question

[Rick DeNatale]

On 7/27/05, Michael Tharp <gxti at partiallystapled.com> wrote:

> 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.

Right, but because of the general case, I don't think that the socket
has any idea of being tied to a particular interface, unless somehow
it got bound to a particular interface with setsockoptions() and that
generally doesn't happen.