Disabling IPv6 in Debian 6:

http://wiki.debian.org/DebianIPv6#How_to_turn_off_IPv6

I ended up going the iptables route for this, I tried changing the sysctl parameters including net.ipv6.conf.all.disable_ipv6=1 etc but they don't seem to work on linode, they work locally on vmware.

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Huh.

Try adding, to your sysctl.conf, net.ipv6.conf.eth0.accept_ra = 0 and net.ipv6.conf.eth0.autoconf = 0... same as the others, just with eth0 in place of default/all. I never did trust Linux's idea of "all"