With this in mind, I would suggest that before you being the installation
and confi guration of ISA Server, that you take a look at a good subnet overview
as either an introduction or a refresher. A decent one can be found here:
www.networkcomputing.com/unixworld/tutorial/001.html. Additionally, when it
comes time to plan out the network, it is always useful to have a subnet calculator
on hand. There are thousands of these online, but this one is pretty easy to
use: www.subnet-calculator.com/.
Hardware Considerations
The system requirements for ISA Server are pretty modest. When you compare the
critical role ISA Server will play in your network against the role Windows Vista might
play it is astonishing to see the antiquated hardware requirements ISA Server needs in
order to function. Microsoft lists the minimum requirements for ISA Server 2006 as
shown in Table 11.1.
382 Chapter 11 ??? Confi guring Microsoft Internet Security and Acceleration Server 2006
Table 11.1 Minimum Hardware Requirements for ISA Server 2006
Standard or Enterprise Edition
Processor 733 Mhz Pentium III
Memory 512 MB
Disk Space 150 MB (NTFS formatted)
The only caveat here is that this is for the basic fi rewalling functionality of ISA
Server. Most administrators will want to make use of the web proxy and caching
functionality. For anyone who has dealt with any caching web proxy, you know that
this function can be extremely demanding (especially in terms of memory requirements).
Pages:
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378