resolv.conf, systemd-resolved, DNS

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# check systemd-resolved status
resolvectl status
resolvectl restart

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

# disable LLMNR
LLMNR=false

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resolvectl query goproxy.cn
resolvectl query baidu.com
resolvectl query google.com

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vim /etc/systemd/resolved.conf

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[Resolve]
# DNS: 上游的 dns 服务器, 可以配置多条, 用空格分隔
DNS=192.168.50.1
# FallbackDNS: 一个空格分隔的 IPv4 与 IPv6 地址列表。用作系统的替补 DNS 服务器。此选项所设置的 DNS 服务器仅在实在找不到可用 DNS 的情况下才会被使用。
FallbackDNS=223.5.5.5 223.6.6.6 114.114.114.114
#Domains=
#LLMNR=yes
#MulticastDNS=yes
#DNSSEC=allow-downgrade
#DNSOverTLS=no
#Cache=yes
#DNSStubListener=yes
#ReadEtcHosts=yes

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# 重启服务
systemctl restart systemd-resolved

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ln -sf /run/systemd/resolve/stub-resolv.conf /etc/resolv.conf

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vim /etc/systemd/resolved.conf
[Resolve]
DNS=192.168.50.1

# link
ln -sf /run/systemd/resolve/stub-resolv.conf /etc/resolv.conf

# restart systemd-resolved
sudo systemctl restart systemd-resolved

# check systemd-resolved status
resolvectl status

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vim /etc/dhcp/dhclient.conf

prepend domain-name-servers 223.5.5.5;
supersede domain-name-servers 223.5.5.5;
sudo dhclient -r
sudo dhclient

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# 重新连接服务
sudo ln -sf /lib/systemd/system/systemd-resolved.service /etc/systemd/system/dbus-org.freedesktop.resolve1.service
# 重启服务 
sudo systemctl restart systemd-resolved.service
# 确认状态
systemd-resolve --status