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Amebis / eduVPN

Windows eduVPN Client
GNU General Public License v3.0
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Support for the "setMTU" Setting in Wireguard #236

Closed xamor closed 3 months ago

xamor commented 3 months ago

Using the Windows eduVPN client the setMTU setting in wireguard seems to bee ignored. The MTU ist still on 1420.

MTU MediaSenseState Bytes In Bytes Out Schnittstelle

  1420                1         92207          8377  eduvpn.uni-konstanz.de

There are some cases we need a lower MTU (vodafone in germany using ds-lite for example).

rozmansi commented 3 months ago

The MTU is configured on the eduVPN server side: https://docs.eduvpn.org/server/v3/wireguard.html#setting-the-mtu

Server prepares .ovpn/wg-quick.conf that eduVPN client passes on to OpenVPN/WireGuard.

xamor commented 3 months ago

Yes, i configured it on the server side, so it seems to work on android but not on windows. The mtu is left on 1420 in windows but on server side it is configured setMtu => 1280

rozmansi commented 3 months ago

Will look into it. See where this gets lost.

rozmansi commented 3 months ago

Almost forgot: Thanks to report it.

rozmansi commented 3 months ago

Looking into this and eduVPN client does set interface MTU: image

Can you activate WireGuard connection using eduVPN client and run netsh interface ipv4 show subinterfaces on your PC to examine the MTU set on your eduVPN server matches the MTU set on the WireGuard interface, please?

rozmansi commented 3 months ago

Also, can you login to https://eduvpn.uni-konstanz.de and create a WireGuard profile there. See if it has the MTU line:

[Interface]
MTU = nnnn
xamor commented 3 months ago

I checked my config again, so i think i found my mistake. "setMtu" is a global Wireguard option... I still don't know why it worked on android but now it is working. I' am Sorry for my mistake and thank you for your help!

You can close this bug report.

rozmansi commented 3 months ago

Appreciate your feedback. Thanks.