Best way to provide options for specifying NIC, determining IP on subnet?

If you're already communicating with other computers using IP, the packets will already be announcing a return address that the far end can use to determine where its messages should go.

There isn't really such a thing as a default ip address of a host. In general though most hosts are configured with a default route that the OS decides to use if it can't find, by looking at it's routing table in conjunction with the destination ip address of the packet, another interface to send a packet out on. This interface will have an ip address and I suppose you could consider it to be the default ip address.

But, in the case of a multi-homed host the source ip address that is used depends on the destination ip address in the ip header and that's worked out by the operating system in conjuction with the routing table. Which is why there's no such thing as a default ip address. And even if you did use the ip address associated with the default route, and told the users of the other hosts about this address there's no gaurantee that a packet from their end to your host will arrive because their hosts might be on a different subnet (i.e.

Not accessable via the default route).

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