Real World NAT64 deployments

William Herrin bill at
Thu Mar 3 17:25:44 CST 2011

On Thu, Mar 3, 2011 at 5:01 PM, Hammer <bhmccie at> wrote:
> A little better. So what's the difference between 6to4 and 6in4? Isn't 6in4
> what HE uses?

I haven't used 6in4 so I couldn't tell you.

6to4 is a stateless tunnelling protocol. You have a dual-stacked
router. It has an IPv4 address, Therefore it supports a 6to4
IPv6 network numbered 2002:0102:0304::/48. Somebody tries to send a
packet to 2002:0102:0304::1, it goes to a 6to4 router which
encapsulates the IPv6 packet in an IPv4 packet and sends it to

6to4 is handy as a toy or for experimenting, but it relies on a loose
network of generous volunteers who, while generous, are neither
generous nor numerous enough to support production traffic.


William D. Herrin ................ herrin at  bill at
3005 Crane Dr. ...................... Web: <>
Falls Church, VA 22042-3004

More information about the NANOG mailing list