/30 ( 255.255.255.252 )

The interface shows: *"ping from X to Y". Trace the physical path:

A router connected to the "Internet" in NetPractice usually has a public IP. The internal clients must use NAT-like logic. However, NetPractice does not simulate NAT deeply; instead, it requires that all internal packets destined for the internet go through a specific gateway with a default route: Destination: 0.0.0.0/0 via Gateway: <internet-router-IP>

Now things get serious. You will see two or three routers connected in a chain.

"Router R1 is connected to Router R2. R2 is connected to R3 and R4. Use OSPF to route traffic from R1 to R4."