From owner-freebsd-hackers Wed Dec 19 13:32:54 2001 Delivered-To: freebsd-hackers@freebsd.org Received: from freebie.xs4all.nl (freebie.xs4all.nl [213.84.32.253]) by hub.freebsd.org (Postfix) with ESMTP id AB4C037B419; Wed, 19 Dec 2001 13:32:48 -0800 (PST) Received: (from wkb@localhost) by freebie.xs4all.nl (8.11.6/8.11.6) id fBJLWgI04937; Wed, 19 Dec 2001 22:32:42 +0100 (CET) (envelope-from wkb) Date: Wed, 19 Dec 2001 22:32:42 +0100 From: Wilko Bulte To: Maxim Konovalov Cc: Yar Tikhiy , net@FreeBSD.ORG, hackers@FreeBSD.ORG Subject: Re: Processing IP options reveals IPSTEALH router Message-ID: <20011219223242.B4906@freebie.xs4all.nl> References: <20011219181929.A20425@comp.chem.msu.su> <20011219190533.W57795-100000@news1.macomnet.ru> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: <20011219190533.W57795-100000@news1.macomnet.ru>; from maxim@macomnet.ru on Wed, Dec 19, 2001 at 07:23:55PM +0300 X-OS: FreeBSD 4.4-STABLE X-PGP: finger wilko@freebsd.org Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On Wed, Dec 19, 2001 at 07:23:55PM +0300, Maxim Konovalov wrote: > > Hello Yar, > > On 18:19+0300, Dec 19, 2001, Yar Tikhiy wrote: > > > Hi there, > > > > 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? I would assume IPSTEALTH is thought to be for firewalls. Allowing source routing thru firewalls is a Bad Thing(TM) anyway, right? -- | / o / /_ _ email: wilko@FreeBSD.org |/|/ / / /( (_) Bulte Arnhem, The Netherlands To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message