Troubleshooting network issues

1.5 hours
  • 2 Learning Objectives

About this Hands-on Lab

In this exercise, you will need to troubleshoot and resolve connectivity issues to a web server.

Learning Objectives

Successfully complete this lab by achieving the following learning objectives:

Verify Server1.

Verify Server1 is running Apache:

systemctl status httpd

Verify Apache is listening on port 80:

ss -lntp | grep 80

Verify the content can be accessed locally:

curl localhost

Verify the firewall is permitting port 80 traffic:

firewall-cmd --list-all

Permit inbound traffic to Apache:

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

Reload the firewall to pickup the change:

firewall-cmd --reload
Verify Server2.

On Server2 (10.0.1.11)

Attempt to pull the web content from Server1 via hostname:

curl ip-10-0-1-10.ec2.internal

Attempt to pull the web content from Server1 via IP

curl 10.0.1.10

Check to see what DNS hosts are being used:

cat /etc/resolv.conf

Verify resolution via the specified host:

dig @10.0.0.2 ip-10-0-1-10.ec2.internal

Verify /etc/nsswitch.conf:

vim /etc/nsswitch.conf

Attempt to pull the web content from Server1 via hostname:

curl ip-10-0-1-10.ec2.internal

Ping ip-10-0-1-10.ec2.internal:

ping ip-10-0-1-10.ec2.internal

Review /etc/hosts:

vim /etc/hosts

Attempt to pull the web content from Server1 via hostname:

curl ip-10-0-1-10.ec2.internal

Install elinks:

yum install -y elinks

Use elinks to view the content:

links -dump http://ip-10-0-1-10.ec2.internal

Additional Resources

Server1 (10.0.1.10) is running Apache.

Server2 (10.0.1.11) must be able to view Server1's Apache content via http://ip-10.0.1.10.ec2.internal using elinks (not currently installed).

What are Hands-on Labs

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.

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