If you use an interface instead of a next hop ip address how does that work?
example: ip route 0.0.0.0 0.0.0.0 s1/0
If a packet for 10.10.10.9 came into the router and the best route was the above default route would the router try to arp for 10.10.10.9 out the s1/0 interface?
I have read some articles that say that packet would just get sent out s1/0 but others which say that the router would try to resolve the L3 address to a L2 mac address.
If the router must resolve the L3 address then the 10.10.10.9 must be in the same broadcast domain as s1/0 or use proxy arp on the downstream router/switch?
One article said this configuration is better for interfaces connected via point to point networks but multi-access networks need more configuration and are not scalable.
I have not come across a config where the interface is used instead of the next hop but I am curious as to when or how it might be used.