From owner-freebsd-current Sat Dec 14 1:29:10 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 5E3F037B406 for ; Sat, 14 Dec 2002 01:29:09 -0800 (PST) Received: from c3po.skynet.be (c3po.skynet.be [195.238.3.237]) by mx1.FreeBSD.org (Postfix) with ESMTP id 1F6CE43ED8 for ; Sat, 14 Dec 2002 01:29:08 -0800 (PST) (envelope-from brad.knowles@skynet.be) Received: from [10.0.1.3] (ip-26.shub-internet.org [194.78.144.26] (may be forged)) by c3po.skynet.be (8.11.6/8.11.6/Skynet-OUT-2.20) with ESMTP id gBE9So710844; Sat, 14 Dec 2002 10:28:50 +0100 (MET) (envelope-from ) Mime-Version: 1.0 X-Sender: bs663385@pop.skynet.be Message-Id: In-Reply-To: References: X-Grok: +++ath X-WebTV-Stationery: Standard; BGColor=black; TextColor=black Reply-By: Wed, 1 Jan 1984 12:34:56 +0100 Date: Sat, 14 Dec 2002 10:25:30 +0100 To: "Jimi Thompson" From: Brad Knowles Subject: Re: TTL Cc: Content-Type: text/plain; charset="us-ascii" ; format="flowed" 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 At 9:14 PM -0800 2002/12/13, Jimi Thompson wrote: > 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. We ran into this problem in '96, when I was working at AOL. We had a guy in California who wanted to send e-mail to his friend across the hall, but of course those packets had to traverse the country to be delivered to our servers in Virginia. We went back and forth a few times, and I even set up tcpdump on the particular machine I told him to connect directly to -- I could see his packets coming in, but our responses were never received. Turns out that, by a quirk of routing fate, he was something like 32 hops away, and while his OS was fine, our particular patch revision of HP-UX 9 was hard-coded at 30. We applied a later patch to the machines, and everything went back to normal. This is not a new problem. Unfortunately, many OSes may still have inappropriate values defined. -- Brad Knowles, "They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety." -Benjamin Franklin, Historical Review of Pennsylvania. GCS/IT d+(-) s:+(++)>: a C++(+++)$ UMBSHI++++$ P+>++ L+ !E-(---) W+++(--) N+ !w--- O- M++ V PS++(+++) PE- Y+(++) PGP>+++ t+(+++) 5++(+++) X++(+++) R+(+++) tv+(+++) b+(++++) DI+(++++) D+(++) G+(++++) e++>++++ h--- r---(+++)* z(+++) To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message