Support for client-side mtu specification on configuration

Official client software for OpenVPN Access Server and OpenVPN Cloud.
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canope
OpenVpn Newbie
Posts: 2
Joined: Tue May 21, 2013 8:32 am

Support for client-side mtu specification on configuration

Post by canope » Tue May 21, 2013 8:48 am

Hi there,

I've used your application for quite a long time .
I ve used guizmovpn and custom made previously .

I still have an issue.....

It s impossible to change the MTu on the client side configuration .. :-(

To explain, we used VPN gateways for accessing resources from various Internet connection..

I ve found that is better to have a link Mtu lower than 1450 for client accessing resources thru 3/4g Internet access ...

We've created specific profiles for client accessing thru these data access but its not working with ovpn connect.


To explain the issue, mobile users Internet packets are encapsulated within the GTP layer used by operators.

This layer use udp packets and don't support acknowledge on standard operator production network.

Full loaded mobile ip packets have to be transported on fragmented packets in the operators networks and a large amount of these fragmented packets are dropped ....

The reassembled packets also arrive in out of order since GTP is order agnostic.. This introduces duplicated asks on the client side and top window shrinking ...

So, to limit the issue, we found that lowering the tun and link mtu to be the better solution...

We cannot change it on the server side since we used mutualized VPN ....

Hoping your help about this point.


Can

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