I'll don the Nomex here and say that rather than turning IPv6 "off", I just block it with pf. I don't know if that is what the OP wants, but it is relatively simple to do (as opposed to twiddling things in the kernel) and it keeps me from having to worry about any unexpected consequences of the box receiving or transmitting IPv6 traffic, which I currently know so little about that I worry about it.

Corey

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