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Anyone who know if this works ?
It works fine on the wisms running 4.2.176 & 1252 radios for client traffic. It "should" probably be fine with your setup too.
Keep in mind that it just passes ipv6 traffic and does not actively participate in ipv6.
If you are trying to use it for management of the radios, I do not know;perhaps in 5.x and above it can for management...
Have you read the release notes on the version you are using
I am running 5.2 on my WiSMs with a dedicated IPv6-only SSID.
Management over IPv6 is not possible at the moment, you even have to give the dynamic interface for that SSID a "dummy"-address - IPv6-addresses and "none" does not work.
IPv6 traffic works however very good then.