[ipv6-wg] RIPE Atlas and NAT64 (Was: IPv6-only network during RIPE 71)

Hi,

On Tue, Nov 03, 2015 at 03:23:29PM +0100, Jen Linkova wrote:
> I think there is a dirty hack to do it now: run a measurements from
> v6-enabled probes to v4-only host, check the results for the
> destination address they were using.

Haha, I know something you don't :-)

$ host ipv4only.arpa
ipv4only.arpa has address 192.0.0.171
ipv4only.arpa has address 192.0.0.170

... if that host ever resolves to a v6 address, you're behind a DNS64.

(It won't *ping*, but it will give away DNS64 and the prefix used - of
course pinging a well-known-ipv4-only-host would even validate whether
the NAT64 is working...)

Gert Doering
        -- NetMaster
-- 
have you enabled IPv6 on something today...?

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