Trouble configure ISA2006 as a caching server on DMZ please help

Hello Everyone

I am new to ISA2006 just downloaded 180days Standard Edition try version and
installed to 2003 R2 Server.
During the installation it asked me to select an adapter and then I click
the add adapter button , it gave me a range of IP address. I accepted the
default setting and finish the installations. I am placing ISA on our
existing DMZ so I configured ISA to use a single network adapter template.

I try to ping the ISA server from internal clients I can't ping it..
Could some one tell me what step I have missed?
What is my next step?
I want our internal clients PC will be able to use the ISA server as a
caching proxy
server..

I am also planning on using the ISA as Reverse proxy for our Exchange 2003
server

any help will be really appreciated

Thank you

Mr555

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