RE: [Openvpn-users] OpenVPN server on a single-NIC machine?

["James Yonan" <jim@xxxxxxxxx>]

"Michael B. Klein" <michael@xxxxxxxxxxxx> said:
 
> P.S. James: FWIW, I'm working on a setup script and GUI front-end to make
> installation and control of OpenVPN easier for Windows end users.  I'll be
> happy to share my results with you if you're interested. Thanks a million
> for OpenVPN!

Michael,

Hey, that's cool.

It would be nice to have a real installer that also installs the tap driver,
and knows how to upgrade everything including the driver if there's a new version.

It would also be great to have some kind of GUI front-end to OpenVPN that
would sit in the system tray along with other daemons.

And one thing I haven't figured out yet...  Does anyone know of an easy way to
programmatically add or remove TAP VPN adapters?  Right now the INF file
installs a single adapter by default, though OpenVPN itself (i.e. the usermode
component) knows how to select one of many TAP VPN adapters using --dev-node.

Another problem is that the driver is hardwired to use an MTU of 1500.  I
tried to make it variable by coding a SET_MTU ioctl call in the driver, but
the problem is that the windows kernel queries the driver for its MTU setting
before the TAP adapter is actually opened from userspace, so setting the MTU
by ioctl in this manner is too late.  The question is how to force the kernel
to requery OID_GEN_MAXIMUM_FRAME_SIZE, OID_GEN_TRANSMIT_BLOCK_SIZE, and
OID_GEN_TRANSMIT_BUFFER_SPACE after the adapter has been opened by OpenVPN.

James




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