[34971] in North American Network Operators' Group
Re: Network for Sale
daemon@ATHENA.MIT.EDU (Steven M. Bellovin)
Thu Feb 22 18:47:13 2001
From: "Steven M. Bellovin" <smb@research.att.com>
To: "davids" <davids@webmaster.com>
Cc: nanog@nanog.org
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Date: Thu, 22 Feb 2001 18:25:51 -0500
Message-Id: <20010222232556.159DD35C42@berkshire.research.att.com>
Errors-To: owner-nanog-outgoing@merit.edu
In message <038901c09d22$d2736280$7c4cf9d1@geeksparadise.com>, "davids" writes:
>
>> And how does "delay" differ from RTT, except for the obvious constant
>> factor?
>>
>> --Steve Bellovin, http://www.research.att.com/~smb
>
> The RTT is the sum of two delays. There is no simple way to separate
>the two. In general, you don't even know what path the return packets are
>taking. This same problem applies to trying to measure packet loss and using
>the results to influence routing decisions.
I understand that, of course, but since the return path is used for the
ACKs that clock the transmissions, I suspect that it's a fair
approximation. Paul's response to my posting was quite fair, in fact.
--Steve Bellovin, http://www.research.att.com/~smb
