Troubleshooting network issues

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Troubleshooting network issues

In this exercise, you will need to troubleshoot and resolve connectivity issues to a web server. *This course is not approved or sponsored by Red Hat.*

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Lab Info

Level

Advanced

Last updated

Sep 23, 2025

Duration

1h 30m

Challenge

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
```
Challenge

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
```

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