Powershell script to setup DNS for WSL on a Cisco VPN

net_for_wsl.ps1

Set-ExecutionPolicy -ExecutionPolicy Bypass -Scope Process

Write-Host > c:\tools\local_ip.txt

# Capture Wi-FI IP address
#Get-NetIPConfiguration | Where-Object {$_.InterfaceDescription -Match "Wi-Fi 6 AX201 160MHz"}  | Where-Object  {$_.NetAdapter.Status -NotMatch "Disconnected"} | Select-Object IPv4Address >> c:\tools\local_ip.txt
#Get-NetIPConfiguration | Where-Object {$_.InterfaceDescription -Match "I219-LM"}               | Where-Object  {$_.NetAdapter.Status -NotMatch "Disconnected"} | Select-Object IPv4Address >> c:\tools\local_ip.txt
Get-NetIPConfiguration | Where-Object  {$_.NetAdapter.Status -NotMatch "Disconnected"}  | Where-Object {$_.InterfaceDescription -NotMatch "Cisco AnyConnect"} | Where-Object {$_.InterfaceDescription -NotMatch "Virtual Ethernet"}  |Select-Object IPv4Address >> c:\tools\local_ip.txt

# Get DNS servers
Get-DnsClientServerAddress -AddressFamily ipv4 | Select-Object -ExpandProperty ServerAddresses > c:\tools\dns_servers.txt

# Change metric to ensure WSL traffic gets routed correctly
Get-NetAdapter | Where-Object {$_.InterfaceDescription -Match "Cisco AnyConnect"} | Where-Object  {$_.Status -NotMatch "Disabled"} | Set-NetIPInterface -InterfaceMetric 6000

# Capture VPN IP address
Get-NetIPConfiguration | Where-Object {$_.InterfaceDescription -Match "Cisco AnyConnect"}  | Select-Object IPv4Address > c:\tools\vpn_ip.txt