netdev - Re: Passive OS fingerprint xtables match.

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Message-ID: <20090219115613.GB4551@ioremap.net>
Date:	Thu, 19 Feb 2009 14:56:13 +0300
From:	Evgeniy Polyakov <zbr@...emap.net>
To:	Jan Engelhardt <jengelh@...ozas.de>
Cc:	Patrick McHardy <kaber@...sh.net>, netdev@...r.kernel.org,
	David Miller <davem@...emloft.net>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Netfilter Development Mailinglist 
	<netfilter-devel@...r.kernel.org>
Subject: Re: Passive OS fingerprint xtables match.

On Wed, Feb 18, 2009 at 04:30:03PM +0100, Jan Engelhardt (jengelh@...ozas.de) wrote:
> >As of IPv6 support - it could be fairly trivial, the only thing we need
> >is to dereference TCP header with the appropriate offset anf get don't
> >fragment bit (ipv6 does not have it, so we could check both entries).
> 
> But IPv6 can have Fragment Headers, serving about the same purpose.
> 
> >But... I do not have IPv6 network to test the changes (and definitely
> >did not have it 6 years ago), so it was never implemented :)
> 
> There exist lots of free VM solutions - and I think UML existed
> 6 years ago, too.

It is not that simple. IPv6 was never a out-of-the-box solution, and in
case of this module we either need to setup a router, or use ipv6-aware
application (fortunately telnet knows that in the recent distros).

-- 
	Evgeniy Polyakov
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