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Date:      Wed, 19 Dec 2001 19:57:20 +0200
From:      Ruslan Ermilov <ru@FreeBSD.ORG>
To:        Maxim Konovalov <maxim@macomnet.ru>
Cc:        Yar Tikhiy <yar@FreeBSD.ORG>, net@FreeBSD.ORG, hackers@FreeBSD.ORG
Subject:   Re: Processing IP options reveals IPSTEALH router
Message-ID:  <20011219195720.B72222@sunbay.com>
In-Reply-To: <20011219195659.G25693-100000@news1.macomnet.ru>
References:  <20011219194903.D21732@comp.chem.msu.su> <20011219195659.G25693-100000@news1.macomnet.ru>

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On Wed, Dec 19, 2001 at 08:54:50PM +0300, Maxim Konovalov wrote:
> On 19:49+0300, Dec 19, 2001, Yar Tikhiy wrote:
> 
> > On Wed, Dec 19, 2001 at 07:23:55PM +0300, Maxim Konovalov wrote:
> > >
> > > > I ran into an absolutely clear, but year-old PR pointing out that
> > > > a router in the IPSTEALTH mode will reveal itself when processing
> > > > IP options: kern/23123.
> > > >
> > > > The fix proposed seems clean and right to me: don't do IP options
> > > > at all when in the IPSTEALTH mode.  Does anyone have objections?
> > > > If no, I'll commit the fix.
> > >
> > > First of all we should decide what IPSTEALTH is for. Is it just a
> > > Ruslan's net.inet.ip.decttl or it should really stealth the fact of
> > > the routing? If the latter how do we behave in source routing case?
> >
> > Are there any reasons for a router not to decrement IP TTL besides
> > trying to stay invisible to a third party?
> 
> imho there are not. I've asked because ru's net.inet.ip.decttl means
> "do not decrement TTL" but not "hide the fact of the routing".
> 
Nope, my net.inet.ip.decttl is the decrementor, it may be 1 (by default),
0 (to hide this router), or 2, 3, etc.


Cheers,
-- 
Ruslan Ermilov		Oracle Developer/DBA,
ru@sunbay.com		Sunbay Software AG,
ru@FreeBSD.org		FreeBSD committer,
+380.652.512.251	Simferopol, Ukraine

http://www.FreeBSD.org	The Power To Serve
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