Chris Bagnall schrieb:
> Greetings list,
> Slightly off-topic, but since there are plenty of folks here who do fairly
> large network installs, I hope it's relevant.
> How do folks calculate the size of a pipe required for net access? Is there
> a particular formula you use?
> When I've been asked to work out details for such things in the past,
> they've been in areas where my answer has always been "the fastest
> available". However, I've just been asked to work out a proposal for a
> 360-seat site in a major city, so options for net access and sizes of pipes
> are far wider.
> Any thoughts?
This is black magic.
For a larger network we calculated that a WinNT-Workstation
needs a 64kbit bandwith in both directions to access the
For Win2K and XP, we were advised to calculate with an
256kbit assumption. You can find these numbers also in the
Thats it for the workstations. The servers can't be
calculated in this manner, that depends on the trafic the
clients will create. Things to keep in mind: SMB doesn't
saturate the bandwith via enlarging the TCP window size, its
doing a time division thing.
If you need AD replication between several servers on
different locations: give them time to do their job. They
send smtp-messages (Exchange also) and hustling with the
replication will damage your replica.
For testing we limited the bandwith between 2 GC servers to
10 mbit, and the replication went on as smoothly as with
the normal 1gbit connection. So, my assumption on this is,
that a *MINUMUM* of 10 mbit is fairly enough for connections
But keep in mind: This is black magic, and if you want that
your assumptions to work in the expected manner, you should
sacrifice a black goat/sheep/cat at fullmoon.