From owner-freebsd-security Fri Oct 12 4:29:45 2001 Delivered-To: freebsd-security@freebsd.org Received: from mail.euroscript-ls.de (mail.euroscript-ls.de [213.68.26.164]) by hub.freebsd.org (Postfix) with ESMTP id 345DC37B401 for ; Fri, 12 Oct 2001 04:29:41 -0700 (PDT) Received: from euroscript-ls.de (testbox.euroscript-ls.de [10.18.10.4]) by mail.euroscript-ls.de (8.10.0/8.10.0) with ESMTP id f9CBTdB85978 for ; Fri, 12 Oct 2001 13:29:39 +0200 (CEST) Message-ID: <3BC6D445.27C078CF@euroscript-ls.de> Date: Fri, 12 Oct 2001 13:30:13 +0200 From: Radoy Pavlov Organization: euroscript Language Services GmbH X-Mailer: Mozilla 4.76 [en] (X11; U; FreeBSD 4.4-STABLE i386) X-Accept-Language: en MIME-Version: 1.0 To: freebsd-security@freebsd.org Subject: Randomizing TCP sequence Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-freebsd-security@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org Hello, I'm trying to randomize my tcp sequence. Upon experimenting with portsentry i made couple of nmap scans and I was suprized to see that the value never exceeds the number of 30, which IMO is weak. I activated net.inet.tcp.strict_rfc1948=1, which should do the randomizing, still i get a value of 30 or so. Are there any particular steps that could be taken to make this happen ? cheers, Radoy To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message