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 http://www.oracle.com Enabling The Information Age To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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