linux-kernel - AW: tcp/ip connect on demand

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Message-ID: <F67862BE33DC784289A6B34E92908FCF394007@SRV-SATURNUS.OPTION.local>
Date:	Fri, 4 Jul 2008 13:04:40 +0200
From:	"Jens-Michael Hoffmann" <J.Hoffmann@...ion.com>
To:	"H. Peter Anvin" <hpa@...or.com>,
	"Jan Engelhardt" <jengelh@...ozas.de>
Cc:	<linux-kernel@...r.kernel.org>
Subject: AW: tcp/ip connect on demand

>Jan Engelhardt wrote:
>> On Thursday 2008-07-03 20:28, H. Peter Anvin wrote:
>>> Jens-Michael Hoffmann wrote:
>>>> hi,
>>>>
>>>> what is the right way to implement a "connect on demand" feature?
>>>> Example: user types url in firefox and presses return. Then
>>>> the system should set up network devices and proceed as usual.
>>>>
>>>> Is there a hook in the kernel we can use?
>>> In the kernel, no.  Nor do you need one; the best place to hook into this is
>>> probably the name service system (so you catch it on trying to look up
>>> hostnames.)
>>>
>>> Alternatively, you can set up a bridge device which you can listen to via a tap
>>> device; when you see traffic, you bring up the real network and attach it to
>>> the bridge.
>> 
>> There is on-demand for PPP devices; though that is probably specific
>> to PPP.

> Yes, those monitor traffic at the PPP device port, I believe.

thanks for the help guys, that looks like what we are looking for.

Best regards

Jens-Michael Hoffmann
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