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Date:	Wed, 27 Feb 2008 21:15:55 -0500
From:	Dan Williams <>
To:	Kevin Lloyd <>
Subject: Re: Network device driver with PPP

On Wed, 2008-02-27 at 17:28 -0800, Kevin Lloyd wrote:
> Hi all,
> I have a device that is currently supported via a combination of loading the device with usb-serial (drivers/usb/serial/sierra) to expose the serial ports and connecting by manually launching pppd.
> I would like to support this device in a network driver as opposed to a serial driver in an effort to offer a seamless always-on device, such as an Ethernet device.
> From what I understand the ppp support in the kernel is only for ppp framing and that all control (e.g., IPCP) is done in user-space via pppd. Are there any network drivers that currently manage the ppp connection (entirely, IPCP included) internally to the driver and expose either a raw ip or ethernet stream to the user-space?

That seems quite icky to do all in kernel space and a pile of code
running in the kernel.  What's so wrong with userspace?  Don't you need
to push values to the driver like username/password and get IP config
out of it (which would involve userspace anyway)?  It just seems like
there's a different solution to your actual problem here than stuff all
off pppd into kernel space.


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