I added a rule to accept connections from 192.168.1.135/24, since my router is configured to hand out /24 addresses. Then, iptables -L -v showed that connections from 192.168.1.0/24 are accepted. When I change the rule to accept connections from .135/32 - or from .135 without specifying the subnet -, it not only works as intended, but it also resolves the hostname correctly.
Why?
unsolicited “why do you still use iptables” advice not welcome :D
Fuck this shit is so complicated.
Don’t worry and don’t mind the downvote. It took me two years, this guy https://www.youtube.com/channel/UCJQJ4GjTiq5lmn8czf8oo0Q and this guy https://www.youtube.com/channel/UCKmU-GKiukM8LYjkJFb8oBQ to get an elementary grasp.