OpenVPN Support Forum

Hello, I would like to use OpenVPN with passtos option in both sides for VoIP calls between IP phones and IP PBX but I dont have find any example about how to do it, anyone ciuld give me a reference?

Now Im working this Pfsense and OpenVPn-Gui on clients but don know where to put the --passtos paramter, would be nice to mantain my Pfsense install but no problem to have a dedicated server on dmz for OpenVPN,
many thanks

sounds like you know what you need from openvpn...
if everything works how you want when running commandline, you need to talk to the pfsense guys

Thanks for reply, if pfsense guys suppost the TOS bit preservation on Pfsense Beta 2.0, but I cant wait for a stable release can take 6 months more, I saw the --passtos option on OpenVpn documentation but dont know how to use it at client side using openvpn-gui, putting it into config file give me an error and dont know how I can add parameters to command line execution of openvpn while using gui at client side (Windows machines).
On server side I can make a virtual machine with anything but all remote workers launch VPNs from Windows client with openvpn-gui.

How I can use the passtos parameter¿?

Many thanks

what error did it give you?
windows gui has nothing to do with the config, you just put the config options into the config, the gui is for starting / stopping the config

I just put passtos parameter at the end of config file, and when try con connect to server it gives me the error:
Options error: Unrecognized option or missing parameter(s) in [conf_file.ovpn]:18: passtos
I also tried with "-" using --passtos wit same result.

Later I saw some where that this option only works on linux machines not on windows clients.
Anyone knows if this is true and if its scheduled a fix to allow passtos on windows machines?

Many thanks

Yes, this is true: the current builds of OpenVPN do not enable --passtos support, most likely due to bad support in the underlying win32 subsystem; this option is missing in both openvpn 2.1.4 and the current build of 2.2RC.
I do not expect this option to be enabled in the final version of 2.2, if somebody can write a patch it could be included for OpenVPN 2.3.