Date: Wed, 19 Dec 2001 19:49:03 +0300 From: Yar Tikhiy <yar@FreeBSD.ORG> To: Maxim Konovalov <maxim@macomnet.ru> Cc: net@FreeBSD.ORG, hackers@FreeBSD.ORG Subject: Re: Processing IP options reveals IPSTEALH router Message-ID: <20011219194903.D21732@comp.chem.msu.su> In-Reply-To: <20011219190533.W57795-100000@news1.macomnet.ru>; from maxim@macomnet.ru on Wed, Dec 19, 2001 at 07:23:55PM %2B0300 References: <20011219181929.A20425@comp.chem.msu.su> <20011219190533.W57795-100000@news1.macomnet.ru>
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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? As for source routing, I believe a stealthy router should just drop such packets as though it were a host. Of course, source-routed packets destined for the router itself should be accepted. -- Yar To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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