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Disabling encryption for ipv6, i.e. 'disable_xfrm'?

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http://www.linuxquestions.org – I need to disable encryption (disable_xfrm) for IPV6. Looked at the /proc/sys/net/ipv6/* but did not find disable_xfrm. Googling the subject, this is controlled by 'ipv4/conf/default/disable_xfrm for IPV6! But setting ipv4/conf/default/disable_xfrm to 1 still does not disable encryption. My linux version is 2.6.21. Unfortunately, I'm stuck with using 2.6.21. - Am I missing a patch? If so, where can I get it? - If 2.6.21 does not support my need, which version of linux supports this? Thanks Much! (HowTos)