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- [Instructor] Once we set up our Ubuntu host as a router,

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the next step is to connect another host

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to our Ubuntu router host to see

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if it functions as a router properly.

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I have an Ubuntu VM already up and running.

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Let's type ifconfig to check the current network settings.

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Press Enter.

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The IP address is 10.0.0.4,

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therefore it belongs to the 10.0.0 subnet

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as shown in this diagram.

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We want this host to be behind our router

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belonging to the 10.0.1 subnet.

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In Azure, to change the subnet of a host,

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go to your VM page.

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Select Networking

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and your network interface.

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Choose IP Configurations.

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Pick the 10.0.1 subnet from the dropdown box.

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Click on Save.

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I'm using Dynamic Host Configuration Protocol,

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or DHCP, for my VMs, therefore DHCP

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automatically assigns a new IP

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to the network interface card of my Ubuntu host

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when I switch the subnet.

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Let's check if I have a new IP.

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Type ifconfig, press Enter.

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The IP is now 10.0.1.5.

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It was initially 10.0.0.4.

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The ultimate test is to check if this Ubuntu host

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can talk to our Ubuntu router host.

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Type ping space 10.0.1.4.

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Press Enter.

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We're getting responses and our experiment is successful.