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 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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