[99322] in North American Network Operators' Group
Re: Question on Loosely Synchronized Router Clocks
daemon@ATHENA.MIT.EDU (Xin Liu)
Mon Sep 17 18:57:52 2007
Date: Mon, 17 Sep 2007 15:54:30 -0700
From: "Xin Liu" <smilerliu@gmail.com>
To: "Randy Bush" <randy@psg.com>
Cc: Valdis.Kletnieks@vt.edu, nanog@merit.edu
In-Reply-To: <46EEFCE0.9000300@psg.com>
Errors-To: owner-nanog@merit.edu
Sorry for the confusion. Let me clarify.
We are interested in a number of questions:
1. Can we assume loosely synchronized router clocks in the Internet,
or we have to make absolutely no assumption about router clocks at
all?
2. If the router clocks are indeed loosely synchronized, what is the
granularity we can assume? Particularly, we are interested in whether
we can assume router clocks are synchronized within 10 minutes.
3. It's always possible that a router's clock goes wrong. In practice,
how often does this happen?
Thank you for all the replies.
Best
Regards,
Xin Liu
On 9/17/07, Randy Bush <randy@psg.com> wrote:
>
> i conversed offline with the OP. he was reading a sigcomm research
> paper and confusing it with the internet.
>
> randy
