This looks interesting. Thanks for submitting it.<p>The first (that I know of) NAT64 implementation was in OpenBSD 5.1
release and there's support in the default firewall/packet filter (pf). I
<i>think</i> FreeBSD has this code working as well, but I'm not sure, and I'm too
lazy to check.<p>Here are some OpenBSD 5.1 release NAT64 details:<p><a href="http://www.h-online.com/open/news/item/NAT64-OpenBSD-5-1-will-translate-between-IPv6-and-IPv4-1443416.html" rel="nofollow">http://www.h-online.com/open/news/item/NAT64-OpenBSD-5-1-wil...</a><p>The following talk on NAT64 is a bit old (2010) but good<p><a href="http://www.bsdcan.org/2010/schedule/events/197.en.html" rel="nofollow">http://www.bsdcan.org/2010/schedule/events/197.en.html</a>