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Date:      Sun, 12 Sep 1999 19:22:28 -0700 (PDT)
From:      "Rodney W. Grimes" <freebsd@gndrsh.dnsmgr.net>
To:        wollman@khavrinen.lcs.mit.edu (Garrett Wollman)
Cc:        des@flood.ping.uio.no (Dag-Erling Smorgrav), nate@mt.sri.com (Nate Williams), ben@scientia.demon.co.uk (Ben Smithurst), jramirez@digicomsystems.net (Jeremy L. Ramirez), dev-null@ns1.digicomsystems.net, freebsd-questions@FreeBSD.ORG, freebsd-security@FreeBSD.ORG
Subject:   Re: How to prevent motd including os info
Message-ID:  <199909130222.TAA31984@gndrsh.dnsmgr.net>
In-Reply-To: <199909130110.VAA27314@khavrinen.lcs.mit.edu> from Garrett Wollman at "Sep 12, 1999 09:10:47 pm"

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> <<On 12 Sep 1999 18:47:23 +0200, Dag-Erling Smorgrav <des@flood.ping.uio.no> said:
> 
> > +tcp_drop_synfin="NO"		# Set to YES to drop TCP packets with SYN+FIN
> > +				# NOTE: this breaks rfc1644 extensions (T/TCP)
> 
> No, it breaks TCP, period, regardless of RFC 1644.  Christmas-tree
> segments are perfectly valid in TCP (i.e., SYN URG PSH FIN).

Okay, are SYN * ^URG * ^PSH * FIN packets, another words packets with
just the SYN and FIN bits set, but not the others used anyplace other
than in T/TCP aka rfc1644?


-- 
Rod Grimes - KD7CAX - (RWG25)                    rgrimes@gndrsh.dnsmgr.net


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