nanog mailing list archives
RE: Microsoft's Black Tuesday bandwidth impact?
From: "Frank Bulk" <frnkblk () iname com>
Date: Wed, 9 Jan 2008 15:38:35 -0600
Adam: Thanks for that detailed explanation. I was under the assumption the MSFT released updates just hours before 3 am (which is also a staggered target across the time zones). With almost a day of lead time (plus computers turned off, Automatic Updates turned off, local SUS servers), the network impact would be minimal, and with day-to-day traffic as varied as it is, probably imperceptible if I compared it to Tuesdays the week before or after. Frank -----Original Message----- From: Stasiniewicz, Adam [mailto:stasinia () msoe edu] Sent: Wednesday, January 09, 2008 3:22 PM To: frnkblk () iname com; nanog () nanog org Subject: RE: Microsoft's Black Tuesday bandwidth impact? I think you misunderstand how Automatic Updates work. The "3 AM" default setting simply defines when Windows will install updates. The actual detection and download of updates (including the file that the scan engine uses) are not done at 3 AM. Using default settings, Windows will run an update check every 22-17.6 hours. The 20% variance is to help prevent floods from computers booted up at the same (for example, a computer lab). This process will: check to see if there is a new update detection file, download an updated list, run a scan to see if the computer needs updates, and download needed updates. Microsoft releases updates on Tuesday at 10:00 AM PST (though some months they have been a few hours late). So to monitor the impact of the updates, look at the traffic between Tuesday 10:00 AM PST through Wednesday 8:00 AM PST. Note, not all computers will get their updates at this time. The most simplest example are computers that are off. But also, many people disable/modify their Automatic Updates settings, while others will use the Windows Update site. Hope that helps, Adam Stasiniewicz -----Original Message----- From: owner-nanog () merit edu [mailto:owner-nanog () merit edu] On Behalf Of Frank Bulk Sent: Wednesday, January 09, 2008 2:48 PM To: nanog () nanog org Subject: Microsoft's Black Tuesday bandwidth impact? Every month I look at my upstream bandwidth graphs and I see no blip in the hours before 3 am on Microsoft's Black Tuesday. I would think that with the thousands of PCs out on our network downloading updates around that time that I would see *something*. I know every Black Tuesday I see my three PC's blinking a logon screen. Are MSFT's monthly updates really a non-event in regards to internet bandwidth? Frank
Current thread:
- Microsoft's Black Tuesday bandwidth impact? Frank Bulk (Jan 09)
- Re: Microsoft's Black Tuesday bandwidth impact? Jared Mauch (Jan 09)
- Re: Microsoft's Black Tuesday bandwidth impact? Alastair Johnson (Jan 10)
- Re: Microsoft's Black Tuesday bandwidth impact? Valdis . Kletnieks (Jan 09)
- RE: Microsoft's Black Tuesday bandwidth impact? Frank Bulk (Jan 09)
- RE: Microsoft's Black Tuesday bandwidth impact? Stasiniewicz, Adam (Jan 09)
- RE: Microsoft's Black Tuesday bandwidth impact? Frank Bulk (Jan 09)
- RE: Microsoft's Black Tuesday bandwidth impact? Gadi Evron (Jan 10)
- RE: Microsoft's Black Tuesday bandwidth impact? Bill Nash (Jan 10)
- Re: Microsoft's Black Tuesday bandwidth impact? Bill Nash (Jan 09)
- RE: Microsoft's Black Tuesday bandwidth impact? Frank Bulk (Jan 09)
- RE: Microsoft's Black Tuesday bandwidth impact? Bill Nash (Jan 09)
- RE: Microsoft's Black Tuesday bandwidth impact? Frank Bulk (Jan 09)
- Re: Microsoft's Black Tuesday bandwidth impact? Jay Hennigan (Jan 09)
- Re: Microsoft's Black Tuesday bandwidth impact? Yukiyasu Tarui (Jan 09)
- RE: Microsoft's Black Tuesday bandwidth impact? Frank Bulk - iNAME (Jan 09)
- Re: Microsoft's Black Tuesday bandwidth impact? Jared Mauch (Jan 09)