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wsl2-net.ps1 is a workaround, for people with Win10 Pro, which uses Hyper-V Virtual Switch functionality, some Powershell, and some bash with WSL commands, to install WSL2 (Ubuntu 20.04), and setup a proof-of-concept WSL2 instance that has NORMAL IP address exposed to local network, as would a standalone VM have. This allows you to access WSL2 services from devices in your local network, or from public Internet (both require propper firewalling and routing rules to be setup on your local network router/firewall device(s))

wsl2-net.ps1

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+# Required
+#    - Windows 10, May 2020 update (version 2004); Pro (Professional) required for Hyper-V Virtual Switch Features
+#    - login to Windows as user with local administrator rights, and run this script by using Windows PowerShell -> Run as Administrator
+#    - Internet connection
+
+# For more complete tutorial, see what someone wrote here, testing WSL2 inside a Hyper-V VM; you can test this script that way if you want
+#  includes whole setup, VM installation, etc:
+#    https://boxofcables.dev/trying-wsl2-on-hyper-v/
+
+# Official docs how to install WSL2 on Win10
+#    https://docs.microsoft.com/en-us/windows/wsl/install-win10
+# or manually install on Windows Server
+#    https://docs.microsoft.com/en-us/windows/wsl/install-on-server
+# Ubuntu docs about the same thing
+#    https://ubuntu.com/wsl
+
+# make a directory for all of this
+New-Item -ItemType "directory" -Path "C:\WSL2-Ubuntu-20.04"
+cd C:\WSL2-Ubuntu-20.04
+
+#### CLEANUP PART ####
+# you can skip / remove this in case you don't want script to touch your existing VM networks
+
+# disconnect your own VMs from WSL switch
+Get-VMNetworkAdapter -VMName * | Disconnect-VMNetworkAdapter
+
+# remove old WSL instance
+wslconfig /u Ubuntu-20.04
+
+# uninstall Ubuntu appx / Windows Store entry
+Get-AppxPackage *ubuntu* | Remove-AppxPackage
+
+# turn off the WSL Windows Feature
+dism.exe /online /disable-feature /featurename:Microsoft-Windows-Subsystem-Linux /norestart
+
+#### INSTALL PART ####
+# turn on the required Windows Features
+Enable-WindowsOptionalFeature -Online -FeatureName VirtualMachinePlatform -NoRestart
+dism.exe /online /enable-feature /featurename:Microsoft-Windows-Subsystem-Linux /all /norestart
+# you can restart later
+
+# Check for newer WSL kernel
+#    https://docs.microsoft.com/en-gb/windows/wsl/wsl2-kernel
+#    https://aka.ms/wsl2kernel
+# download kernel (MSI installation package)
+Invoke-WebRequest -Uri https://wslstorestorage.blob.core.windows.net/wslblob/wsl_update_x64.msi -OutFile wsl_update_x64.msi -UseBasicParsing
+# install the MSI quietly
+msiexec /i wsl_update_x64.msi /qn
+
+# set WSL2 with new kernel as default
+wsl --set-default-version 2
+# set default user to root; WARNING! NOT SAFE!
+ubuntu2004 config --default-user root
+
+# manuall / scripted install of WSL 2
+#    https://docs.microsoft.com/en-us/windows/wsl/install-manual
+# download Ubuntu 20.04
+Invoke-WebRequest -Uri https://aka.ms/wslubuntu2004 -OutFile Ubuntu2004.appx -UseBasicParsing
+# install the appx
+Add-AppxPackage .\Ubuntu2004.appx
+# rename and unzip the archive
+Rename-Item .\Ubuntu2004.appx .\Ubuntu2004.zip
+Expand-Archive .\Ubuntu2004.zip .\Ubuntu2004
+# run exe to install, this takes some time; may hang, can be interrupted after 1 minute
+.\Ubuntu2004\ubuntu2004.exe
+
+#### NETWORKING PART 1 ####
+# for clarity - "Killer e2200 GbE NIC" is the name of my own physical NIC (network card, adapter)
+#    yours is probably named something else, so change all occurances accordingly
+#    if you have multiple NICs pick one that you want WSL to use
+#    WARNING! can be destructiove, if you have multiple NICs AND/OR other VMs please read the script before executing!
+
+# shutdown WSL if it's running already
+wsl --shutdown
+# remove existing WSL Virtual Switch, it will throw error, it is expected, but it will reset WSL switch to default state
+Remove-VMSwitch WSL
+# set your physical net adapter by disabling VM/Hyper-V related functionality and bringing up TCP/IP
+#    not really needed if you did not use WSL or Hyper-V before
+#    if you have other VMs connected this will mess it up probably
+Disable-NetAdapterBinding -name "Killer e2200 GbE NIC" -ComponentID vms_pp
+Enable-NetAdapterBinding -name "Killer e2200 GbE NIC" -ComponentID ms_tcpip
+# connect WSL virtual switch to your physical network adapter (NIC)
+Set-VMSwitch WSL -NetAdapterName "Killer e2200 GbE NIC"
+# enable normal TCP/IP on this adapter
+Enable-NetAdapterBinding -name "vEthernet (WSL)" -ComponentID ms_tcpip
+# if you have any other VMs, we will connect them to WSL switch;
+#    if you have multiple NICs, and/or use other NIC for your other VMs, comment the line below not to mess up your networking
+Get-VMNetworkAdapter -VMName * | Connect-VMNetworkAdapter -SwitchName WSL
+
+#### NETWORKING PART 2 ####
+# we will create script that reconfigures Ubuntu networking to DHCP+static DNS instead of that dynamic Microsoft stuff
+# make an empty script file
+New-Item -ItemType "file" -Path "C:\WSL2-Ubuntu-20.04\net-script.sh"
+# write script; requires double quotes for new lines
+Set-Content C:\WSL2-Ubuntu-20.04\net-script.sh "#my networking script
+# remove all IPs from current WSL interface
+ip addr flush dev eth0
+# enable DHCP for that interface
+dhclient eth0
+# make wsl.conf and tell it NOT to re-generate your DNS resolve configuration from now on
+echo $'[network]\ngenerateResolvConf = false' > /etc/wsl.conf
+# setup your static DNS server, I use Google's 8.8.8.8 here
+echo $'nameserver 8.8.8.8' > /etc/resolv.conf
+# apply network settings
+netplan apply
+# check new IP
+ip addr
+# install Apache, you could install anything else, this is just like proof of concept
+apt-get install apache2 -y
+# if install worked, WSL can access Internet
+# now enable default Apache site
+a2ensite 000-default
+# restart server
+service apache2 restart
+# check if you can access web page at http://xxx.xxx.xxx.xxx (your WSL's IP)
+"
+# convert Windows line enddings with Unix style
+[string]::Join( "`n", (gc "C:\WSL2-Ubuntu-20.04\net-script.sh")) | sc "C:\WSL2-Ubuntu-20.04\net-script2.sh"
+
+# copy script from Windows directory to Ubuntu temp folder
+wsl cp /mnt/c/WSL2-Ubuntu-20.04/net-script2.sh  /var/tmp/net-script2.sh
+# run it inside Ubuntu!
+wsl bash /var/tmp/net-script2.sh
+# if script executed completely go try open that website from some device in your local network (that has access rights to it)
+# if you can open - you are done! now your WSL2 has normal network
+
+# Closing thoughts:
+# this is a one-time install script, but you will need a shorter version of this script to be run EVERY time you change networks or reboot PC or WSL2
+# this shorter script doesn't need the # CLEANUP PART # or # INSTALL PART #, just the two networking parts
+# good thing is this is standalone script, all in one file, so you don't need to do anything inside WSL separately after reboots/restarts
+# to make it easier, either put this script in your startup scripts/tasks, or add a shotcut to your desktop and run it manually
+# you will need to have this script running whenever you want normal networking on WSL2, until Microsoft listens to users and actually fixes it
+# for more info see WSL2 issue https://github.com/microsoft/WSL/issues/4210 (and all related issues, there are dozens)
+
+# Change history:
+# - 2020-06-28 : Lux, initial version, not yet throughly tested, but working on my PC