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When is it necessary to setup a pool of more than one address?

So if I have this ip pool range:

ip nat pool demo netmask

What's the difference if I just have one address?

ip nat pool demo netmask

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can't you overload the nat pool? – dbasnett Apr 23 '10 at 1:25
up vote 4 down vote accepted

If you're using overload (PAT), it only makes a difference if you make very many (tens of thousands) of simultaneous outbound connections. If you're not using overload, you'll need one outside global IP address per inside local IP address that will be translated through that pool.

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makes sense. thanks. – hfranco Apr 23 '10 at 14:56

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