wsl linux无法访问网络

• No network connection in any distribution under WSL 2
• No internet connection on WSL Ubuntu (Windows Subsystem for Linux)

核心原因是PC端为WSL服务的虚拟网卡异常，导致wsl的网络无法访问网络。重置PC端的网络——使用管理员权限打开CMD命令行，重置如下的所有网络，然后重启PC

netsh winsock reset
netsh int ip reset all
netsh winhttp reset proxy
ipconfig /flushdns

wsl端的linux上的/etc/resolv.conf文件中可以看到自动生成的nameserve地址为PC端的虚拟网卡地址——

# This file was automatically generated by WSL. To stop automatic generation of this file, add the following entry to /etc/wsl.conf:
# [network]
# generateResolvConf = false
nameserver 172.19.176.1

可以定制wsl端的linux的启动选项，增加network端的配置（不自动生成resolv.conf文件）。实测还是自动生成文件比较靠谱，只有确保PC端的网络正常，wsl端的网络就可以恢复。(遇到无法编辑这个文件的情况，使用sudo vim /etc/resolv.conf操作时，提示"resolv.conf" E166: Can't open linked file for writing)

可以通过stat /etc/resolv.conf看到这个文件的状态，类似——

 File: /etc/resolv.conf -> ../run/resolvconf/resolv.conf
  Size: 29              Blocks: 0          IO Block: 4096   symbolic link
Device: 810h/2064d      Inode: 44358       Links: 1
Access: (0777/lrwxrwxrwx)  Uid: (    0/    root)   Gid: (    0/    root)
Access: 2021-07-02 08:38:47.580000000 +0800
Modify: 2021-05-31 11:27:04.000000000 +0800
Change: 2021-05-31 17:01:15.490000000 +0800
 Birth: -