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Re: [Openvpn-users] OpenVPN doesn't detect TAP devices


  • Subject: Re: [Openvpn-users] OpenVPN doesn't detect TAP devices
  • From: "James Yonan" <jim@xxxxxxxxx>
  • Date: Sun, 9 May 2004 07:54:14 -0000

For some unknown reason, certain Windows systems (such as XP SP2) have a
problem where the TAP-Win32 adapter installs fine but then doesn't show up in
the network connections panel.

I've made a patch (in 2.0-test29) that tries to work around such cases.

Up until now, OpenVPN would not sense a TAP adapter unless it was in the
network connections panel, or more accurately in the registry data structures
which contain the data which is displayed by the network connections panel.

On Windows, the registry info for network adapters is actually separate from
the registry info displayed by the network connections panel.  So a network
adapter could be correctly installed, but still not show up in the network
connections panel.  In such cases, OpenVPN would not be able to sense the TAP
adapter.

In 2.0-test29, OpenVPN will no longer depend on a TAP adapter existing in the
network connections control panel registry list.  If the TAP adapter is
missing from the network connections list, it will still show up with the
--show-adapters flag, and it can still be referenced by --dev-node, using the
adapter's GUID as it's --dev-node name.  So now, --dev-node supports either
the friendly, renameable name from the network connections panel (as it's
always done), or the low-level GUID which uniquely identifies each adapter on
the system, including those which are hidden from the network connections
panel.  If you use a GUID with --dev-node, make sure to enclose it in braces.

James

Doug Lytle <support@xxxxxxxxxx> said:

> Make sure you're logged in with Administrative Privileges.
> 
> Doug
> 
> Nakamura Masahiro wrote:
> 
> >Hello
> >
> >I installed OpenVPN and tried to run but it didn't detect
> >any TAP devices. The device is shown in the device manager
> >and ipconfig shows its name as GUID like format.
> >I tried 1.5, 1.6rc4, 2.0-test28 but none of them was
> >successfully installed.
> >The TAP device isn't shown on the network connection panel either.
> >
> >This machine running Windows XP Pro + SP1 with one ethernet card
> >and it is connected to the Internet through a firewall and a router.
> >
> >Am I missing something or is it a known problem?
> >
> >Thanks.
> >
> >
> >
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> 
> 
> 
> 
> 
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