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Can one disable the IPv6 stack on Debian Linux, especially Wheezy? If so how do I know if it's disabled on a system?

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To check if IPv6 is disabled through sysctl :

sysctl -a|grep disable_ipv6
5

Yes, you can:

echo net.ipv6.conf.all.disable_ipv6=1  > /etc/sysctl.d/disableipv6.conf 
sysctl --system

But you might need to do several other things, as described in the related article in the Debian wiki. The description for squeeze should still be valid for Wheezy.

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