Date: Sat, 14 Dec 2002 10:25:30 +0100 From: Brad Knowles <brad.knowles@skynet.be> To: "Jimi Thompson" <jimit@myrealbox.com> Cc: <current@freebsd.org> Subject: Re: TTL Message-ID: <a05200f00ba20a8a20b27@[10.0.1.3]> In-Reply-To: <JBEBLBLAABEOPMEPFAKEIEHKCCAA.jimit@myrealbox.com> References: <JBEBLBLAABEOPMEPFAKEIEHKCCAA.jimit@myrealbox.com>
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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, <brad.knowles@skynet.be>
"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(+++)
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