Nearly all IPv6 functionality for *BSD operating Systems was developed by the KAME project. With time more and more of their code makes it into the platforms FreeBSD (4.0), NetBSD (1.5), OpenBSD (2.7) and MacOS X (10.2). This means, that from the respective versions on, IPv6 will be switched on and available on all those platforms by default. You don't need to do anything. You can verify this with the command "ifconfig".

# ifconfig
rl0   flags=8943 mtu 1500
        inet 128.176.184.9 netmask 0xffffff00 broadcast:128.176.184.255
        inet6 fe80::2e0:18ff:fe50:b5da%rl0 prefixlen 64 scopeid 0x1
        ether 00:e0:18:50:b5:da
        media: Ethernet autoselect (100baseTX )
        status: active

The "inet6" line gives the presence of an IPv6 stack away. That means your *BSD host is already operating as a dual-stack host, deciding itself, when to use which kind of transport.

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by ironwalker