Re: help with interfaces gr
Geoff Thompson <Geoff_Thompson.ENGIN#u#THREE@engtwomac.synoptics.com> Sat, 07 August 1993 18:13 UTC
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Date: Fri, 06 Aug 1993 20:21:53 -0000
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From: Geoff Thompson <Geoff_Thompson.ENGIN#u#THREE@engtwomac.synoptics.com>
Subject: Re: help with interfaces gr
To: Greg Fisher <fisher@tinton.ccur.com>, snmp@psi.com, enet_mib@ftp.com, anil@levers.enet.dec.com
Reply to: RE>>help with interfaces gro The dot3 preamble plus SFD is 8 bytes when transmitted by an "interface". That can change as it goes through a network. You lose a little going through AUIs, transceivers and cables. You gain a little going through repeaters. The maximum you can gain going through a legal network is 30 bits. Geoff Thompson Vice chair 802.3 -------------------------------------- Date: 8/6/93 8:15 PM To: Geoff Thompson From: Greg Fisher [ 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
- Re: help with interfaces gr Geoff Thompson