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A Cloud Guru

Port Forwarding with the Firewall

In this learning activity, you will need to configure port forwarding that will selectively forward web requests from one host to another.

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Path Info

Level

Advanced

Duration

1h 0m

Published

Nov 14, 2018

Challenge

Verify port 80 is open on `Server1` and `Server2`

You will want to verify that content is being served over port 80 on both Server1 and Server2.

From Client1:

Once logged into Client1, you can verify web content availability from Server1 and Server2 with these commands:

curl 10.0.1.10

curl 10.0.1.20
Challenge

Create a Zone named `testing` to Handle the Subnet Requests

On Server1:

Create a new firewall zone:

firewall-cmd --permanent --new-zone=testing

Reload the configuration, to pick up the new zone:

firewall-cmd --reload

Add the subnet as the source :

firewall-cmd --permanent --zone=testing --add-source=10.0.1.0/24

Make sure http as a service is added:

firewall-cmd --permanent --zone=testing --add-service=http

Reload the configuration to pick up these changes:

firewall-cmd --reload
Challenge

Enable Masquerading for the Zone

You will need to enable masquerading for the zone, in order to permit forwarding:

firewall-cmd --permanent --zone=testing --add-masquerade

Reload to pick up the new configuration:

firewall-cmd --reload
Challenge

Add the Forwarding Rule to the Zone

You will need to add the rule to forward the traffic coming in to the zone on port 80 out to 10.0.1.20:80:

firewall-cmd --permanent --zone=testing --add-forward-port=port=80:proto=tcp:toport=80:toaddr=10.0.1.20

Reload the configuration:

firewall-cmd --reload
Challenge

Confirm the Port is Forwarded

Confirm the port forward by running curl on the site from Client1:

curl 10.0.1.10

Author

A Cloud Guru

The Cloud Content team comprises subject matter experts hyper focused on services offered by the leading cloud vendors (AWS, GCP, and Azure), as well as cloud-related technologies such as Linux and DevOps. The team is thrilled to share their knowledge to help you build modern tech solutions from the ground up, secure and optimize your environments, and so much more!

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