From owner-freebsd-current Fri Dec 13 19:55:58 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 49DF737B401 for ; Fri, 13 Dec 2002 19:55:57 -0800 (PST) Received: from troutmask.apl.washington.edu (troutmask.apl.washington.edu [128.208.78.105]) by mx1.FreeBSD.org (Postfix) with ESMTP id 7F61E43EF1 for ; Fri, 13 Dec 2002 19:55:56 -0800 (PST) (envelope-from sgk@troutmask.apl.washington.edu) Received: from troutmask.apl.washington.edu (localhost [127.0.0.1]) by troutmask.apl.washington.edu (8.12.6/8.12.6) with ESMTP id gBE3tuNd011076; Fri, 13 Dec 2002 19:55:56 -0800 (PST) (envelope-from sgk@troutmask.apl.washington.edu) Received: (from sgk@localhost) by troutmask.apl.washington.edu (8.12.6/8.12.6/Submit) id gBE3tuxe011075; Fri, 13 Dec 2002 19:55:56 -0800 (PST) Date: Fri, 13 Dec 2002 19:55:55 -0800 From: Steve Kargl To: Jimi Thompson Cc: current@FreeBSD.ORG Subject: Re: TTL Message-ID: <20021214035555.GA11067@troutmask.apl.washington.edu> 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. > troutmask:sgk[202] sysctl -a | grep -i ttl net.inet.ip.ttl: 64 -- Steve To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message