Routing Lab
Download the network for Packet Tracer

All IP addresses have been included but there is no routing.
Check that the clock is set on all serial links.
Add static routes to each of the Paris and Berlin Router LAN interfaces so that traffic is directed to the London LAN.
The syntax for this is:
Router(config)#ip route 0.0.0.0 0.0.0.0 w.x.y.z
Where w.x.y.z is the IP address of the NEXT interface that the packet will be routed.
Check that this works for any IP packet by using the simulation tab.
What do you see in the routing table that indicates that a default route has been set?