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# check systemd-resolved status
resolvectl status

# disable dns on 53 port
vim /etc/systemd/resolved.conf
#switch off binding to port 53
DNSStubListener=no

#disable LLMNR
LLMNR=false

https://cloud-atlas.readthedocs.io/zh_CN/latest/linux/redhat_linux/systemd/systemd_resolved.html