我如何更换 DNS？除了systemd-networkd和wpa_supplicant无线之外，我没有使用网络管理器wpa_cli。如果重要的话，我在使用 Arch Linux。
尽管我可以将 DNS 添加到我的配置中、systemctl restart systemd-resolved覆盖/etc/resolv.conf（符号链接到/run/systemd/resolve/resolv.conf）或重新启动，但不知何故将默认 ISP DNS 添加到/etc/resolv.conf。有谁知道为什么，或者如何解决这个问题以仅使用我配置的 DNS？
当我编辑/etc/resolv.conf为仅包含
nameserver 208.67.222.222
nameserver 208.67.220.220
并运行systemctl restart systemd-resolved或重新启动，默认的 ISP DNS 将被覆盖，如下cat /etc/resolv.conf所示：
# This file is managed by systemd-resolved(8). Do not edit.
#
# Third party programs must not access this file directly, but
# only through the symlink at /etc/resolv.conf. To manage
# resolv.conf(5) in a different way, replace the symlink by a
# static file or a different symlink.
nameserver 75.75.75.75
nameserver 192.168.1.1
nameserver 208.67.222.222
# Too many DNS servers configured, the following entries may be ignored.
nameserver 75.75.76.76
nameserver 208.67.220.220
如下所述man resolved.conf，我确保只有一个配置文件，/etc/systemd/resolved.conf.d/resolv.conf包含
# This file is part of systemd.
#
# systemd is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or
# (at your option) any later version.
#
# See resolved.conf(5) for details
[Resolve]
DNS=208.67.222.222 208.67.220.220
#FallbackDNS=8.8.8.8 8.8.4.4 2001:4860:4860::8888 2001:4860:4860::8844
#LLMNR=yes
并且这里的所有配置文件中没有其他定义我的 DNS 的文件：
/etc/systemd/resolved.conf
/etc/systemd/resolved.conf.d/*.conf
/run/systemd/resolved.conf.d/*.conf
/usr/lib/systemd/resolved.conf.d/*.conf
我也不相信我正在运行任何 dhcpcd 或 netctl 服务，并且systemctl | grep dhcpcd，并且systemctl | grep netctl没有返回任何内容。
答案1
我通过将以下内容添加到我的网络配置文件中来解决了此问题/etc/systemd/network/*.network：
[DHCP]
UseDNS=false
默认情况下，这是正确的，这意味着 DNS 服务器从 DHCP 网络连接中获取。如果我禁用此功能，并输入我自己的静态 DNS（即 OpenDNS），那么我可以确保只使用我选择的 DNS。