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Disable IPv6 in a 2.6 kernel

Thu, 2005-03-17 13:37 — chris

Debian linux running a 2.6 kernel

To disable IPv6 you need both the following lines in your /etc/modprobe.conf file


alias ipv6 off
alias net-pf-10 off

Thanks to the guys on the #debian freenode channel for help with this.

Update

Moved the config to /etc/modprobe.d/local

Update

This stopped working on 2.6.18 on debian etch. Now my /etc/modprobe.d/local now contains just


blacklist ipv6

Apparently - in some cases this may still not work - in that case it is possible to try


install ipv6 /bin/true

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Comments

Sat, 2005-04-09 17:00 — chris
chris's picture

Interesting. I knew that

Interesting. I knew that modutils and modules.conf is 2.4 stuff. According to the modprobe manpage it can use the optional /etc/modprobe.conf and /etc/modprobe.d directory - I do know that it works with /etc/modprobe.conf - so it appears that both approaches work.

Sat, 2005-04-09 15:12 — David (not verified)

Thanks, your hint got me

Thanks, your hint got me going in the right direction. I'll share what more I've learned today on #debian:

1. /etc/modprobe.conf is not needed (used?) anymore. Instead, modprobe just reads all the files in /etc/modprobe.d
2. /etc/modutils, /etc/modules.conf, and update-modules are only used by a 2.4 kernel. If you have these files but don't want to go back to a 2.4 kernel, use aptitude to purge the modutils package
3. To disable IPv6 you should put both of those lines mentioned into /etc/modprobe.d/local (a new file for me)
4. You can use "modprobe -c | less" to see what modules it finds out of /etc/modprobe.d
5. Reboot after putting the lines into /etc/modprobe.d/local, then it should be disabled.

-David

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