DNS64 (rfc6147) support on the Flagfox Geotool website

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DNS64 (rfc6147) support on the Flagfox Geotool website

Post by ptitgnu » Thu Jun 30, 2022 1:10 pm


I have been using an IPv6 only network since 2017 with transition mechanisms (NAT64/DNS64) on the router.

When I go to a site using legacy IP only, the IPv4 are translated to IPv6 using the well known 64:ff9b::/32 prefix and the add-on seems to work fine.

( more informations here : https://en.wikipedia.org/wiki/IPv6_tran ... nism#DNS64 )

However, when I click on the flag and go to the Geotool website, the IP address is not recognised (see screenshot).


In this example, the add-on refers to https://iplookup.flagfox.net/?ip=64%3Af ... lagfox.net
If I remove the ip block and leave only the hostname, the website does the name resolution and it works.
Would it be possible that the add-on does not specify the IP in its query when it starts with 64:ff9b:: (or another solution) ?

Thanks ;)



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Re: DNS64 (rfc6147) support on the Flagfox Geotool website

Post by rleeden » Thu Jun 30, 2022 3:02 pm


Thanks for bringing this to my attention. Not a scenario I had considered before.

I have made a small change to the website, that should deal with this situation. Hopefully without breaking anything else ;)

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