How To Enable IPv6 in Apache Web Server

By default, IPv6 is disabled in Apache web server. IPv6 offers better speed and performance over IPv4. So it is advisable to enable IPv6 for your website. Here is how to enable IPv6 in Apache web server.

How to Enable IPv6 in Apache Web Server

Here are the steps to configure IPv6 in Apache web server.

1. Find out IPv6

Before you enable IPv6, it is important to find out the IPv6 address of your Linux system. You can do this using ipconfig & grep command.

# ifconfig |grep inet6
         inet6 2001:0db8:85a3:0000:0000:8a2e:0370:7334  prefixlen 64  scopeid 0x0<global>
         inet6 ::1  prefixlen 128  scopeid 0x10<host>

In the above output, your IPv6 address is the string between inet6 and prefixlen, that is, 2001:0db8:85a3:0000:0000:8a2e:0370:7334

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2. Enable IPv6 in Apache

Open Apache configuration file

# sudo vi /etc/httpd/conf/httpd.conf

Add Listen directive, along with the IPv6 address of your Linux system.

Listen [2001:0db8:85a3:0000:0000:8a2e:0370:7334]:80

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3. Restart Apache Server

Restart Apache web server

# sudo service httpd restart

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4. Verify IPv6 in Apache

Run the netstat command to verify that IPv6 is enabled in Apache.

# netstat -anlp |grep 80
tcp6       0      0 2001:0db8:85a3:0000:0000:8a2e:0370:7334:80 :::*   LISTEN      23047/httpd   

You should see the second line starting with tcp6 and mentioning your IPv6 address.

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5. Update DNS AAAA record

Finally, you need to update the AAAA record of your domain in your domain registrar. Once it is updated, you can verify it using an IPv6 testing tool.

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