Re: help with interfaces group

Greg Fisher <fisher@tinton.ccur.com> Sat, 07 August 1993 03:26 UTC

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Subject: Re: help with interfaces group
To: snmp@psi.com, enet_mib@ftp.com
Date: Fri, 06 Aug 1993 20:05:45 +0000
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From: Greg Fisher <fisher@tinton.ccur.com>
Cc: anil@levers.enet.dec.com
In-Reply-To: <9308061621.AA08762@us1rmc.bb.dec.com> from "Anil Rijsinghani" at Aug 6, 93 12:21:37 pm
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Message-Id: <9308061605.aa17029@tinton.tinton.ccur.com>

[ Anil writes ]
> 
> Here are some answers.  By the way, the enet_mib@ftp.com mailing list
> would be a better place to ask these questions.
> 
...
> 
> > 8) Although the MIB says that ifInOctets should include "framing characters",
> > my hardware doesn't provide any indication of the length of the received
> > preamble.  Should I ignore the preamble or add an estimate (8 bytes per
> > packet) to the total count?
> 
> Don't include preamble.
Why not?

The way I thought about it was that the preamble was using available
bandwidth on account of a given transmission, and so represents part of the
"framing" overhead which was being referred to in rfc1213.

BTW, I thought the dot3 preamble was 7 bytes. No?  Does it vary?
...
> Anil

Greg Fisher