Out of curiosity, @abranson, my IPv6-only provider’s ipv4only.arpa cannot be pinged but I get its IPv6 addresses back. What is exactly the “query” to determine if the CLAT is needed or how to check from the command line that the CLAT “query” (or connection attempt) makes this decision ? Shall the ipv4only.arpa reply to a ping ?
[root@Xperia10III defaultuser]# ping -6 ipv4only.arpa
PING ipv4only.arpa (64:ff9b::xyzë:ab): 56 data bytes
--- ipv4only.arpa ping statistics ---
3 packets transmitted, 0 packets received, 100% packet loss
[root@Xperia10III defaultuser]# getent hosts ipv4only.arpa
64:ff9b::xyzë:ab ipv4only.arpa
64:ff9b::xyzë:aa ipv4only.arpa
(I have failed to find the time to try your repo - I get the IPv4 from my IPv4-only ProtonVPN which is on all the time [but not during the above test]. I follow with interest the great work of your guys to get CLAT on SailfishOS!)