From owner-freebsd-pf@FreeBSD.ORG Tue Feb 7 21:44:25 2012 Return-Path: Delivered-To: freebsd-pf@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 0B038106566C for ; Tue, 7 Feb 2012 21:44:25 +0000 (UTC) (envelope-from prvs=37759e5cc=Thomas.Carroll@pnnl.gov) Received: from emailgw03.pnl.gov (emailgw03.pnl.gov [192.101.109.31]) by mx1.freebsd.org (Postfix) with ESMTP id E33B78FC08 for ; Tue, 7 Feb 2012 21:44:23 +0000 (UTC) Received: from we16293.pnl.gov (HELO [130.20.185.116]) ([130.20.185.116]) by emailgw03.pnl.gov with ESMTP; 07 Feb 2012 12:44:21 -0800 Message-ID: <4F318D0D.7090601@pnnl.gov> Date: Tue, 07 Feb 2012 12:43:57 -0800 From: Tom C User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:9.0) Gecko/20111222 Thunderbird/9.0.1 MIME-Version: 1.0 To: freebsd-pf@freebsd.org Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Subject: Match on MSS value X-BeenThere: freebsd-pf@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "Technical discussion and general questions about packet filter \(pf\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 07 Feb 2012 21:44:25 -0000 Good afternoon! Is there a way within pf to match TCP SYN packets with a given MSS value? I want to distinguish between TCP traffic with small MSS values (e.g., mss < 1300) and ``normal'' values. Thanks in advance. ~ Tom C