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

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Message-ID: <486D2564.4030806@zytor.com>
Date:	Thu, 03 Jul 2008 12:15:48 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jan Engelhardt <jengelh@...ozas.de>
CC:	Jens-Michael Hoffmann <J.Hoffmann@...ion.com>,
	linux-kernel@...r.kernel.org
Subject: Re: 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.

	-hpa
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