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NFR Wizards Archives: Re: Sizing a firewall

Re: Sizing a firewall

Subject: Re: Sizing a firewall
From: Bill_Roydspch.gc.ca
Date: Thu Dec 30 1999 - 19:42:09 CST

I work for another Canadia government agency with about 4000 ~ 5000 users (Hi
Walt :-)). Are usage is about 10-12 GB /day over a T1+of which about 25% is our
webserver traffic, 10% is email traffic and rest internal users going out to
Internet. This saturates the Internet link at peak time of day (internal network
is 100mbit Ethernet to Internet router). The application proxy firewall is not
the bottleneck but Internet connection is.
  Since this is a government department with 5x users, scaling would say a T1 is
very inadequate. so it probably will be completely saturated in short order.

Walt Sullivan <walttrytel.com> on 99/12/29 18:18:51

Please respond to Walt Sullivan <walttrytel.com>

To: firewall-wizardsnfr.net
cc: (bcc: Bill Royds/HullOttawa/PCH/CA)
Subject: Sizing a firewall

I'm consulting for a Canadian government agency that plans to allow
desktop access to the Internet for the first time next year (yes, I
know, "Forward into the 70's", but is is government).

They think they have about 25,000 desktops (Windows 95/98, shudder).

How can I help them predict the amount of traffic they'll see on their
T1 connection?

Is there anybody out there running a firewall for 25K desktops that is
willing to share an order-of-magnitude guess?

Thanks,

Walt 

--
Walt Sullivan
UNIX & Networks, Security & SysAdmin
walttrytel.com
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