I noticed that disabling IPv6 on the VPS network interfaces makes resolving some websites faster. In my particular case, I have a web app on the VPS that connects to an external website and grabs data via the API. When I tried running the web app it would take about 10-20 seconds for the page to load and after some investigation it appears that disabling IPv6 on the interfaces made the web app load in 2-3 seconds.

The first thing to do is check whether the interfaces on the VPS server is actually using IPv6. Just issue ifconfig -a on the terminal as root or su:

DISABLING IPV6 ON THE VPS FASTER INTERNET CONNECTION SPEEDS before disabling IPv6 The Simple Entrepreneur

To disable IPv6 on all the network interfaces (disabling on just the main interface didn’t help – I had to disable on all interfaces) on a CentOS system you need to do add the following code in the /etc/sysctl.conf file:

net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1

Just like this.

DISABLING IPV6 ON THE VPS FASTER INTERNET CONNECTION SPEEDS systctl conf file The Simple Entrepreneur

Restart the VPS and then check again the ifconfig -a to see if it’s removed the IPv6 addresses from the interfaces:

DISABLING IPV6 ON THE VPS FASTER INTERNET CONNECTION SPEEDS after disabling IPv6 The Simple Entrepreneur

Test and see if it the speed is faster. I hope this helps.

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