Kenneth Kalmer wrote:
Guys
Considering the festive season is upon us, thanks to everyone
contributing to the list and helping all the readers with your great
input! I don't want to mention names, I'll most certainly leave
someone out.
With this mail I'd like to test some theory on bandwidth management,
with my own successes and failures during the past year.
Sharing a link between 200 users
This has probably been my worst headache this year, since all the
trials go well but the implementation doesn't run as expected. So here
goes. We have one connection that is shared by 200 users. Mostly
students, so abuse is rampant. Each user should have an upper-limit
for speed, but the upper limit times the number of users exceed the
link capacity (over subscription). The speed must degrade as more and
more users are online, so that in peak times the link must still be
usable for each and every user, even if dreadfully slow.
Here is the implementation in theory:
Total internet capacity: X
Total number of users: 200
Minimum transfer rates: Y = X / 200
Maximum transfer rates: Z = 8 * Y
Over subscription rate: 1:50
Are we talking about ingress or egress?
How much bandwidth do you have (and how much are you sacrificing)?
What are the lengths of queues for each user?
What is the link DSL/other?
Andy.
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