From owner-freebsd-current Fri Dec 13 19:21:31 2002 Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 0738937B401 for ; Fri, 13 Dec 2002 19:21:30 -0800 (PST) Received: from lakemtao04.cox.net (lakemtao04.cox.net [68.1.17.241]) by mx1.FreeBSD.org (Postfix) with ESMTP id 53F2743EB2 for ; Fri, 13 Dec 2002 19:21:29 -0800 (PST) (envelope-from ataraxia@cox.net) Received: from arkadia.nv.cox.net ([68.98.181.29]) by lakemtao04.cox.net (InterMail vM.5.01.04.05 201-253-122-122-105-20011231) with ESMTP id <20021214032130.VHA22825.lakemtao04.cox.net@arkadia.nv.cox.net>; Fri, 13 Dec 2002 22:21:30 -0500 Received: by arkadia.nv.cox.net (Postfix, from userid 1001) id 750231144D; Fri, 13 Dec 2002 22:21:28 -0500 (EST) Date: Fri, 13 Dec 2002 22:21:28 -0500 From: Ray Kohler To: Jimi Thompson Cc: current@freebsd.org Subject: Re: TTL Message-ID: <20021214032128.GA85760@arkadia.nv.cox.net> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.4i Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On Fri, Dec 13, 2002 at 09:14:06PM -0800, Jimi Thompson wrote: > > > This is an issue that we recently ran into at work and I wanted to mention > this since 5.0 isn't released yet. I don't know if FreeBSD has addressed > this or not but thought it should be mentioned just in case. We've > discovered that in many *nix OS's the TCP stack sets the default TTL for > packets to 30. Apparently, IBM (AIX) had not and our research showed that > most of the other *nix OS's hadn't either. > > With the increasing complexity of the internet, this is often a problem for > those who have large internal networks and/or live in Australia. 30 hops > often isn't enough to make to the core DNS. It probably ought to be > extended to something more realistic. The other numbers that I've seen used > 64, 128, and 256. I'm not completely sure but I believe the default TTL on 5.0 is 64. I've briefly tested this by pinging myself and watching the output, but if there are any special cases for that then I could very well be wrong. -- Ray Kohler Those who do not understand Unix are condemned to reinvent it, poorly. -- Henry Spencer To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message