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06 June 2009

How to disable IPV6 for Debian linux

After Debian is installed the IPV6 is enabled by default. However, we are still using IPV4 address format (xxx.xxx.xxx.xxx) and is still commonly use in the internet. And I wish to minimize troubleshooting of any connectivity issues between each of my virtual machines, so I decided to disable the IPV6 and use only IPV4. The below are those steps:

edit the file named /etc/modprobe.d/aliases
remark the line with the text alias net-pf-10 ipv6
add 2 new lines below it :
alias net-pf-10 off
alias ipv6 off

edit also the file named /etc/hosts
remark all the lines started with ipv6

Finally, restart the computer.

To verify whether IPV6 is disabled successfully, using the below 2 commands:

# netstat -tunlp
(you should not see the word ipv6)

# lsmod | grep ipv6
(you should not get anything screen output)

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