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Date:	Wed, 20 Aug 2014 12:20:14 +0200
From:	Alexander Holler <>
To:	Hagen Paul Pfeifer <>
CC:	Eric Dumazet <>,
	Christian Grothoff <>,
	Jacob Appelbaum <>,
	Andi Kleen <>,
	Stephen Hemminger <>,
	David Miller <>,
	netdev <>,,
Subject: Re: [PATCH] TCP: add option for silent port knocking with integrity

Am 20.08.2014 11:47, schrieb Alexander Holler:
> Am 20.08.2014 11:28, schrieb Hagen Paul Pfeifer:
>> On 20 August 2014 11:07, Alexander Holler <> wrote:
>>> For sure it could be better, but I'm already happy with the current
>>> imperfect solution which I can use now and not some perfect solution
>>> which
>>> might be available in some years.
>> Alexander, to make it clear: we cannot include mechanisms which
>> probably open other (security) issues. This is not how things work
>> out. TCP had so many issues in the past - regarding security,
>> implementation f*ups, etc. pp. It is utterly important that there is
>> no problem with an extension. Please join the discussion ob tcpm if
>> you will drive things forward. That's all what I can say - sorry!
> Maybe I first should send a million syn-packets to a box where I've
> enabled that feature. ;)
> Anyway, I still think there should be some room for experimental
> features in the kernel. It makes them more visible to possible
> contributors and helps to drive further development.
> Not necessarily in my case (as most people, I can't and don't want to
> participate in all parties), but ...

And as I've just read the archives of tcpm, I don't think it would help. 
Jacob Appelbaum already expressed everything I like to use this feature 
for, so most of the time I just had to send a +1 to Jacobs comments, 
which would be somewhat annoying. ;)


Alexander Holler

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