wireguard折腾记录

条件：有一个动态公网ip的服务器(openwrt)，NameSilo域名+DDNS
需求：有两个局域网需要打通and有一个无公网ip的机器需要内网传统。

尝试两个wireguard服务器互联

两个服务器都安装wireguard，然后配置好服务器端和客户端，然后两个服务器互联，可以互相ping通。用ipv6链接，盲猜校园网可以免流。

等等先

解决动态公网ip变更后wireguard无法连接的问题

自动重连、自动更新配置文件、自动更新域名解析

From: https://v2ex.com/t/863087

官网上说是不会自动解析域名，所以配置里面EndPoint填的是域名也没有用。

Endpoint with changing IP After resolving a server's domain, WireGuard will not check for changes in DNS again. If the WireGuard server is frequently changing its IP-address due DHCP, Dyndns, IPv6, etc., any WireGuard client is going to lose its connection, until its endpoint is updated via something like wg set " $INTERFACE" peer "$ PUBLIC_KEY" endpoint "$ENDPOINT". Also be aware, if the endpoint is ever going to change its address (for example when moving to a new provider/datacenter), just updating DNS will not be enough, so periodically running reresolve-dns might make sense on any DNS-based setup. Luckily, wireguard-tools provides an example script /usr/share/wireguard-tools/examples/reresolve-dns/reresolve-dns.sh, that parses WG configuration files and automatically resets the endpoint address. One needs to run the /usr/share/wireguard-tools/examples/reresolve-dns/reresolve-dns.sh /etc/wireguard/wg.conf periodically to recover from an endpoint that has changed its IP. One way of doing so is by updating all WireGuard endpoints once every thirty seconds[6] via a systemd timer:

bash

git clone https://git.zx2c4.com/wireguard-tools /usr/share/wireguard-tools

bash

# sudo vim /etc/systemd/system/wireguard_reresolve-dns.timer
[Unit]
Description=Periodically reresolve DNS of all WireGuard endpoints

[Timer]
OnCalendar=*:*:0/30

[Install]
WantedBy=timers.target

bash

# sudo vim /etc/systemd/system/wireguard_reresolve-dns.service
[Unit]
Description=Reresolve DNS of all WireGuard endpoints
Wants=network-online.target
After=network-online.target

[Service]
Type=oneshot
ExecStart=/bin/sh -c 'for i in /etc/wireguard/*.conf; do /usr/share/wireguard-tools/contrib/reresolve-dns/reresolve-dns.sh "$i"; done'

bash

sudo systemctl enable wireguard_reresolve-dns.service wireguard_reresolve-dns.timer --now