Seems like AI wrote this. And did a good job!

An alternative to MusicBrainz Picard is Lidarr. No sonic analysis but it can organize and rename your library among other things.

Picard is the better option for music organization though.

I found an informative post about a related issue that might be of some use to you. Sounds like DHCP or Network Manager may be rewriting your systems-resolved.conf.

https://joshrnoll.com/my-tailscale-dns-woes/

Have you tried deleting /etc/systemd/resolved.conf and restarting the service with systemctl restart systemd-resolved?

Did you undo the reverse path strict filtering your guide suggested?

net.ipv4.conf.default.rp_filter = 1
net.ipv4.conf.all.rp_filter = 1

Above is what the guide suggests to force reverse path strict filtering. Try setting as shown below:

net.ipv4.conf.default.rp_filter = 0
net.ipv4.conf.all.rp_filter = 0

According to the guide, “By default, these are set in /usr/lib/sysctl.d/50-default.conf”