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Re: [Openvpn-users] --dev vs --dev-node


  • Subject: Re: [Openvpn-users] --dev vs --dev-node
  • From: "James Yonan" <jim@xxxxxxxxx>
  • Date: Tue, 6 Jan 2004 19:59:09 -0000

h105@xxxxxxx said:

> 
> 
>  Hi,
> 
>   I'm a bit confused with the purpose of --dev vs --dev-node.
> 
>   On Linux I'm using  only --dev  and things work fine (I've 
> --mktun'd a few interfaces ahead of time)
> 
>   But on Windows -  what does --dev refer to, and what does 
> --dev-node refer to ?

Think of --dev as selecting the tunnel type and unit number such as "tun" or
"tap" or "tun5" and --dev-node selecting the device filename of the specific
tun or tap device to use.

On linux 2.4, you don't generally need to specify --dev-node because the
default of "/dev/net/tun" is usually correct.  So if you just say --dev tun on
linux, it causes OpenVPN to automatically allocate a dynamic tun interface.

On windows, --dev-node must be used because each tun/tap device has its own
filename associated with it, in the part of the directory structure windows
uses for devices (i.e. windows' /dev equivalent).  This is because windows
does not support dynamic device units.

James


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