From owner-freebsd-questions@FreeBSD.ORG Thu May 26 15:01:40 2011 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id DAD88106564A for ; Thu, 26 May 2011 15:01:40 +0000 (UTC) (envelope-from fsb@thefsb.org) Received: from smtp204.iad.emailsrvr.com (smtp204.iad.emailsrvr.com [207.97.245.204]) by mx1.freebsd.org (Postfix) with ESMTP id B73338FC19 for ; Thu, 26 May 2011 15:01:40 +0000 (UTC) Received: from localhost (localhost.localdomain [127.0.0.1]) by smtp50.relay.iad1a.emailsrvr.com (SMTP Server) with ESMTP id 88731370A69 for ; Thu, 26 May 2011 10:44:23 -0400 (EDT) X-Virus-Scanned: OK Received: by smtp50.relay.iad1a.emailsrvr.com (Authenticated sender: fsb-AT-thefsb.org) with ESMTPSA id 2DC9B37035B for ; Thu, 26 May 2011 10:44:22 -0400 (EDT) User-Agent: Microsoft-MacOutlook/14.10.0.110310 Date: Thu, 26 May 2011 10:44:19 -0400 From: Tom Worster To: FreeBSD Message-ID: Thread-Topic: Can net.inet.tcp.msl be set per interface? Mime-version: 1.0 Content-type: text/plain; charset="US-ASCII" Content-transfer-encoding: 7bit Subject: Can net.inet.tcp.msl be set per interface? X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 26 May 2011 15:01:40 -0000 If a server has one interface to the Internet and another interface to a switch connecting to a few other servers, it seems TCP's MSL value might reasonably be set a lot lower on the private interface. I'm specifically thinking of a lot of short MySQL connections between the servers on the private LAN. The average number of MySQL client connections in TIME_WAIT will be proportional to MSL. And, while the circumstances under which a long MSL would help anything are unimaginable on the LAN, they are not on the Internet. So can net.inet.tcp.msl be set per interface? Tom