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I know there's a wiki entry http://wiki.debian.org/DebianIPv6#How_to_turn_off_IPv6 that shows how to disable IPv6 in Debian Squeeze, but that's a 2.6.* kernel.

What about 3.2.* kernels running Wheezy?

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at least '/sys/module/ipv6/parameters/disable_ipv6' still exists for Kernel 3.2.0xxx – sparkie Feb 5 at 10:38
@sparkie yeah but wiki.debian.org/DebianIPv6#How_to_turn_off_IPv6 says nothing about /sys/module/ipv6/parameters/disable_ipv6 but /etc/sysctl.d/disableipv6.conf – Ian Feb 5 at 14:18

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Disabling IPv6 on more recent systems works the same way as described in the Debian wiki:

Disable ipv6 in kernel : echo net.ipv6.conf.all.disable_ipv6=1 > /etc/sysctl.d/disableipv6.conf will disable ipv6 at next reboot.

Keep in mind that, whatever problem you are having, this should be an absolute last resort after you have exhausted all other options for fixing the problem. IPv6 is not optional and you will have to turn it back on sooner or later.

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