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Permitting and Blocking Traffic with the Firewall

In this hands-on lab, you will need to configure `Server1` ( so that it only permits HTTP connections (port 80) from `Client1` (

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Path Info

Clock icon Intermediate
Clock icon 30m
Clock icon Nov 14, 2018

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Table of Contents

  1. Challenge

    Verify that a firewall is running.

    You should already have iptables started and running. You can verify this with:

    # systemctl status iptables

  2. Challenge

    Verify that the host listening on port 80.

    You'll want to verify that the host has a service listening on port 80. You can do so using the following command:

    # ss -lntp | grep :80

    You should see that port 80 is listening for the httpd process.

  3. Challenge

    Verify that port 80 is blocked, and add a rule to permit traffic coming from

    From Client1 (, try to curl

    [cloud_user@ip-10-0-1-11 ~]$ curl

    You'll need to add a rule to permit the traffic:

    iptables -I INPUT -p tcp -s --dport 80 -j ACCEPT

    Test from Client1 again, and also with Client2. If Client1 is successful and Client2 isn't, save your existing chain with:

    [root@ip-10-0-1-10 ~]# service iptables save

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