I have a relay server that is specified in the Syncthing config by FQDN.
The Server is dual-stacked and valid, DNSSEC signed A and AAAA records exist with a long TTL of 86400.
I notice that Syncthing is querying and getting valid responses for this FQDN every 1-10 seconds, sometimes several times per second. It seems to disregard the TTL. The peer is successfully joining the relay and not showing any signs of connectivity issues that would necessitate looking up the relay’s DNS records over and over.
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