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NAT Dynamic and Dynamic PAT(Hide)

Posted on 2014-12-17
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Last Modified: 2014-12-26
IN ASA firewall , when Adding Network Object in NAT Rules, I see options: Static, Dynamic PAT(Hide), Dynamic.
Static, is translating one internal IP address  to one external IP address.
What about the 2 others Dynamic PAT(Hide), Dynamic ? can someone explain the difference ?

Any help will be very much appreciated.

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Question by:jskfan
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Don Johnston earned 500 total points
ID: 40506003
Dynamic NAT is where you have a pool of addresses that get allocated to different host traffic.  In its most basic form, you could have 30 addresses which you own (or rent).   You would put those addresses in a pool.  Then as users try to get outside, an address is assigned to that host for the duration.  When they're done, the address gets returned to the pool as available.  In a manner of speaking, its similar to DHCP. Except instead of assigning addresses to hosts, its assigning addresses for NAT use.

PAT (also known as "One-to-many" or "overloading") is where all the hosts on your network have their inside addresses translated to a single outside address. This is probably the most common type of NAT in use today.
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Author Comment

by:jskfan
ID: 40506138
OK... I believe with PAT, the NAT will add a random port number to the public address.

I do not know why it says "Hide"
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by:Don Johnston
ID: 40518417
IIRC, Dynamic PAT (hide) is overloading a NAT pool.
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Author Comment

by:jskfan
ID: 40518432
I know PAT is overloading, it is adding a random port number to the IP.
I am not sure about the word "Hide"
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by:Don Johnston
Don Johnston earned 500 total points
ID: 40518438
I think you're getting stuck on a piece of non-essential nomenclature.

The "(Hide)" is just another indicator that overloading (or PAT) is in effect.
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Author Comment

by:jskfan
ID: 40518881
OK....I was curious (...)
Thanks
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Author Closing Comment

by:jskfan
ID: 40518883
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