Excellent Chapter on TCP/IP Architecture
Fortunately, the ISA and TMG firewalls only support IPv4, so you won’t have to bend your mind around IPv6. However, you still need to understand IPv4.
How to do it? A good start it to read this free chapter on the MS TechNet site on TCP/IP architecture.
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Thomas W Shinder, M.D., MCSE
Sr. Consultant / Technical Writer