My calculations are off, I though the monthly periodic was relative to the system install date. Here are the new numbers:
Lets say each client sends 20 bytes and their are 10^7 clients for a total of 190.7MB per month. Now... Lets say 50% (10^6.7) of those clients are set to UTC and all of them trigger on the first of the month within 5 minutes of each other (10^6 per minute). This equates to 16706 clients per second. We would need 326KB/s or 2610Kbit/s to handle this load. This is a problem, even half of that is a problem. On 7/29/06, Nikolas Britton <[EMAIL PROTECTED]> wrote:
On 7/29/06, User Freebsd <[EMAIL PROTECTED]> wrote: > On Fri, 28 Jul 2006, Ted Mittelstaedt wrote: > > > You might think this sounds harmless but folks have done this kind of > > thing in the past with other products and wreaked havoc on the Internet. > > You can start by referencing "dlink ntp fiasco" in google to get an idea > > of what can happen to these kinds of well meaning attempts. Let > > sleeping dogs lie. > > 'k, you lost me on how this relates to the fiasco ... I did a quick search > on Google for it, and, unless I didn't find the right reference, the > 'fiasco' had to do with DLink setting up their software to ping PHKs NTP > Server, without getting permissions first, and, thereby, flooding him with > NTP requests ... > > > People just don't realize just how very big the Internet is. > > That is the problem, yes ... nobody knows how big the FreeBSD community is > ... :) > I have to agree with Marc on this one. The extra load required to send all of this data is not much: Lets say each client sends 20 bytes and their are 10^7 clients for a total of 190.7MB per month or 6.25MB per day . Now... Lets say 50% (10^6.7) of those clients are set to UTC and 50% of those clients (10^6.4) trigger the monthly periodic over a 5 day period (10^5.7 each day) and all of them phone home within 5 minutes of each other (10^5 per minute) for a total of 1666.67 clients per second. We would need 32.6KB/s or 260.4Kbit/s to handle this load spike... I did the calculations for 10 million clients, but I highly doubt FreeBSD has 5 million so this is a non issue.
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