Find you who is your last resolver:
kdig TXT resolver-ip.dynamic.estada.ch
kdig TXT resolver-ip.dynamic.estada.ch @dynamic.estada.ch
See who is increasing the TTL on the way by comparing a source query with your upstream resolver
kdig TXT dynamic.estada.ch
kdig TXT dynamic.estada.ch @dynamic.estada.ch
kdig TXT long.dynamic.estada.ch
Responds with a longer TTL
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