SBS 2003 NAT Translation

Posted on 2005-04-26
Last Modified: 2012-06-27
Does SBS and ISA server handle NAT the way that we understand NAT, and if so, can you point me to resources that explain it properly.  I am unable to find something useful on the Internet thus far.
Question by:pm2001
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    by:Jeffrey Kane - TechSoEasy
    Isn't NAT NAT?  :-)  Yeah, I know there are tons of ways to handle though... it seems as though every router manufacturer thinks they've found a better way.

    It's fairly straightforward in SBS... here's a BASIC overview:

    The best site for ISA info is and you'll find both tutorials and peer help there.  Here's their tutorial for ISA's SecureNAT Client setup:

    LVL 74

    Accepted Solution

    Sorry... I grabbed the wrong link for the "BASIC" overview... that one isn't SBS.  Here's what I meant to post:;en-us;837453

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    Expert Comment

    Use ISA over RRAS for your NAT - since ISA is a firewall, all translations and routing are handled by ISA.

    Not sure what you mean by "handle NAT", but, yes - ISA treats NAT the same way routers do only it's implemented slightly different than hardware.

    This is how NAT works in XP - assume it is a similar implementation in ISA:

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