UbuntuHelp:WebBrowsingSlowIPv6IPv4

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https://help.ubuntu.com/community/WebBrowsingSlowIPv6IPv4

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Ubuntu has a newer Internet protocol called IPv6 turned on by default. However, a lot of older hardware — such as NICs and modems — only support IPv4. This leaves you wondering why Internet applications seem slower. This guide shows how to disable this new protocol.

Disabling IPv6

Ubuntu:

• gksudo gedit /etc/modprobe.d/blacklist
• Add this line: blacklist ipv6
• Save the file and restart your computer

Kubuntu:

• kdesu kate /etc/modprobe.d/blacklist
• Add this line: blacklist ipv6
• Save the file and restart your computer

After restarting, open up a terminal and type:

ip a | grep inet6

If there's no output, IPv6 is disabled.

Another method (perhaps simpler) is editing /etc/modprobe.d/aliases and replacing "alias net-pf-10 ipv6" with "alias net-pf-10 off". Done!