- A Cloud Guru
Permitting and Blocking Traffic with the Firewall
In this hands-on lab, you will need to configure `Server1` (10.0.1.10) so that it only permits HTTP connections (port 80) from `Client1` (10.0.1.11).
Table of Contents
Verify that a firewall is running.
You should already have iptables started and running. You can verify this with:
# systemctl status iptables
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.
Verify that port 80 is blocked, and add a rule to permit traffic coming from 10.0.1.11.
Client1(10.0.1.11), try to
[cloud_user@ip-10-0-1-11 ~]$ curl 10.0.1.10
You'll need to add a rule to permit the traffic:
iptables -I INPUT -p tcp -s 10.0.1.11 --dport 80 -j ACCEPT
Client1again, and also with
Client1is successful and
Client2isn't, save your existing chain with:
[root@ip-10-0-1-10 ~]# service iptables save
What's a lab?
Hands-on Labs are real environments created by industry experts to help you learn. These environments help you gain knowledge and experience, practice without compromising your system, test without risk, destroy without fear, and let you learn from your mistakes. Hands-on Labs: practice your skills before delivering in the real world.