A laptop and a server sit on different subnets. Place them, add a router, cable everything and set the addresses until they can talk.
Put a laptop on 192.168.1.0/24 and a server at 203.0.113.80 on 203.0.113.0/24.
Join the two subnets with a router, one cable and one address per side.
Press Run, then check the goals and try ping and traceroute from the laptop.
Drag a part onto the canvas, or select a part and then the canvas.
Drag a part here, or pick one up and tap here, to start building.
Select a device to set its addresses, gateway and routes. Select a cable to remove it. A device is selected by tapping it, or by focusing it and pressing Enter.
Goals
Press Run to check
The laptop is on 192.168.1.0/24
The server is at 203.0.113.80
The laptop pings the server
traceroute from the laptop shows the router, then the server
The server reaches the laptop
Stuck, or done and want to compare? Try it yourself first.
IPv4 only, one packet at a time, Linux behaviour (iproute2 output from Ubuntu 24.04). No DHCP, DNS or NAT in this lab, and every address must be private or from the documentation blocks.