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benduran/Set MTU size in WSL to fix discrepancies between VPN clients on Windows Host and the WSL machine.md

Created March 15, 2022 20:49
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Set MTU size in WSL to fix discrepancies between VPN clients on Windows Host and the WSL machine
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Set MTU size in WSL to fix discrepancies between VPN clients on Windows Host and the WSL machine.md

Update MTU without entering a password¶

This corrects issues you might have with various VPN Clients having discrepancies with MTU size between WSL and the Windows Host.

Create a file /usr/local/sbin/mtu and add the following:

#!/bin/bash

ip link set dev eth0 mtu 1400

Then update the permissions by running sudo chmod u+x,go-rwx /usr/local/sbin/mtu

Next create /etc/sudoers.d/mtu using the command sudo visudo -f /etc/sudoers.d/mtu. Now add the following to the file, replacing <YOUR_USERNAME_HERE> with the output of whoami:

<YOUR_USERNAME_HERE> ALL=(root) NOPASSWD: /usr/local/sbin/mtu

Finally, in your .zshrc or .bashrc add the line:

sudo mtu

To apply your changes, exit and run wsl --shutdown from Powershell.

@fourpastmidnight
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This is a lifesaver. Thank you!

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