title: WSL2 network unreachable
body: <p>A couple of weeks ago, WSL suddenly could not reach any IP addresses nor resolve any domains.  Even internal network IPs are not reachable.</p>
  <pre><code>&gt;lsb_release -a
  Distributor ID: Ubuntu
  Description:    Ubuntu 20.04.1 LTS
  Release:        20.04
  Codename:       focal
  
  ❯ neofetch
              .-/+oossssoo+/-.               klewis@NOTEBOOK-KLEWIS
          `:+ssssssssssssssssss+:`           ----------------------
        -+ssssssssssssssssssyyssss+-         OS: Ubuntu 20.04.1 LTS on Windows 10 x86_64
      .ossssssssssssssssssdMMMNysssso.       Kernel: 5.4.72-microsoft-standard-WSL2
     /ssssssssssshdmmNNmmyNMMMMhssssss/      Uptime: 1 hour, 20 mins
    +ssssssssshmydMMMMMMMNddddyssssssss+     Packages: 1405 (dpkg)
   /sssssssshNMMMyhhyyyyhmNMMMNhssssssss/    Shell: zsh 5.8
  .ssssssssdMMMNhsssssssssshNMMMdssssssss.   Theme: Adwaita [GTK3]
  +sssshhhyNMMNyssssssssssssyNMMMysssssss+   Icons: Adwaita [GTK3]
  ossyNMMMNyMMhsssssssssssssshmmmhssssssso   Terminal: Windows Terminal
  ossyNMMMNyMMhsssssssssssssshmmmhssssssso   CPU: Intel i7-7820HK (8) @ 2.903GHz
  +sssshhhyNMMNyssssssssssssyNMMMysssssss+   Memory: 968MiB / 5942MiB
  .ssssssssdMMMNhsssssssssshNMMMdssssssss.   Font: Cantarell 11 [GTK3]
   /sssssssshNMMMyhhyyyyhdNMMMNhssssssss/
    +sssssssssdmydMMMMMMMMddddyssssssss+
     /ssssssssssshdmNNNNmyNMMMMhssssss/
      .ossssssssssssssssssdMMMNysssso.
        -+sssssssssssssssssyyyssss+-
          `:+ssssssssssssssssss+:`
              .-/+oossssoo+/-.
  </code></pre>
  <pre><code>❯ ifconfig
  
  ❯ ccat /etc/resolv.conf
  nameserver 9.9.9.9
  nameserver 8.8.8.8
  
  ❯ ccat /etc/wsl.conf
  [user]
  default=klewis
  
  # Now make it look like this and save the file when you're done:
  [automount]
  root = /
  options = &quot;metadata&quot;
  
  [network]
  generateResolvConf = false
  </code></pre>
  <pre><code>❯ ping 127.0.0.1
  ping: connect: Network is unreachable
  ❯ ping 192.168.0.1
  ping: connect: Network is unreachable
  ❯ ping 8.8.8.8
  ping: connect: Network is unreachable
  ❯ ping google.com
  ping: google.com: Temporary failure in name resolution
  ❯ nslookup google.com 9.9.9.9
  net.c:536: probing sendmsg() with IP_TOS=b8 failed: Network is unreachable
  ;; connection timed out; no servers could be reached
  
  ❯ ip route
  Error: ipv4: FIB table does not exist.
  Dump terminated
  
  ❯ ip addr show
  1: lo: &lt;LOOPBACK&gt; mtu 65536 qdisc noop state DOWN group default qlen 1000
      link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  2: bond0: &lt;BROADCAST,MULTICAST,MASTER&gt; mtu 1500 qdisc noop state DOWN group default qlen 1000
      link/ether 86:9a:be:53:f0:44 brd ff:ff:ff:ff:ff:ff
  3: dummy0: &lt;BROADCAST,NOARP&gt; mtu 1500 qdisc noop state DOWN group default qlen 1000
      link/ether 1e:ff:ad:a4:c4:a7 brd ff:ff:ff:ff:ff:ff
  4: sit0@NONE: &lt;NOARP&gt; mtu 1480 qdisc noop state DOWN group default qlen 1000
      link/sit 0.0.0.0 brd 0.0.0.0
  5: eth0: &lt;BROADCAST,MULTICAST&gt; mtu 1500 qdisc noop state DOWN group default qlen 1000
      link/ether 00:15:5d:b7:f4:da brd ff:ff:ff:ff:ff:ff
  </code></pre>
  <pre><code>C:\&gt; ipconfig
  Ethernet adapter vEthernet (WSL):
  
     Connection-specific DNS Suffix  . :
     Description . . . . . . . . . . . : Hyper-V Virtual Ethernet Adapter #7
     Physical Address. . . . . . . . . : 00-15-5D-E5-0C-1B
     DHCP Enabled. . . . . . . . . . . : No
     Autoconfiguration Enabled . . . . : Yes
     Link-local IPv6 Address . . . . . : fe80::1962:7d4e:a75e:8d62%78(Preferred)
     IPv4 Address. . . . . . . . . . . : 192.168.16.1(Preferred)
     Subnet Mask . . . . . . . . . . . : 255.255.240.0
     Default Gateway . . . . . . . . . :
     DHCPv6 IAID . . . . . . . . . . . : 1308628317
     DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-27-B3-1F-34-9C-B6-D0-DD-8C-CF
     DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1
                                         fec0:0:0:ffff::2%1
                                         fec0:0:0:ffff::3%1
     NetBIOS over Tcpip. . . . . . . . : Enabled
  </code></pre>
  <pre><code>&gt;sudo ip route add default via 192.168.16.1
  Error: Nexthop has invalid gateway.
  </code></pre>
  <p>I have looked through GH and found solutions that worked for others.  Things I have tried:</p>
  <ul>
  <li>
  <pre><code>netsh winsock reset
  netsh int ip reset all
  netsh winhttp reset proxy
  ipconfig /flushdns
  </code></pre>
  </li>
  <li><p>deleted Hyper-V virtual adapters and restarting to let Windows rebuild</p>
  </li>
  <li><p>Changed where the Virtual Switch connects to in Hyper-V Virtual Switch Manager from Internal Network to External Network</p>
  </li>
  <li><p>Ensured %TEMP% is not compressed</p>
  </li>
  <li><p>Ensured no file nor folder under %TEMP% were compressed</p>
  </li>
  <li><p>Ensured no firewall was running</p>
  </li>
  <li><p><a href="https://github.com/microsoft/WSL/issues/4926" rel="noreferrer">https://github.com/microsoft/WSL/issues/4926</a></p>
  </li>
  <li><p><a href="https://github.com/microsoft/WSL/issues/4731" rel="noreferrer">https://github.com/microsoft/WSL/issues/4731</a></p>
  </li>
  <li><p>turned off Generation of resolv.conf and add gateway, 9.9.9.9 and 8.8.8.8 to resolv.conf</p>
  </li>
  </ul>