Diff Bet. NAT "Outside source & Inside destination"

From: Amr (amr.ccie@gmail.com)
Date: Wed Sep 24 2008 - 06:30:34 ART

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Dear All,
            I am confused between the following lines

ip nat inside destination list 1 pool POOL
access-list 1 permit 10.10.10.1
ip nat pool POOL 20.20.20.1 20.20.20.1 prefix-length 24

&

ip nat outside source list 2 pool POOL
access-list 2 permit 20.20.20.1
 ip nat pool POOL 10.10.10.1 10.10.10.1 prefix-length 24

i understand from the nat inside destination the following :
if a packet comes from the inside that has a destination 10.10.10.1 the
destination will be nated to 20.20.20.1 & also if a packet comes from the
outside that has a source 20.20.20.1 the source will be nated to 10.10.10.1

and i understand from the nat outside the following :
if a packet comes from the outside interface with a source 20.20.20.1 the
source will be nated to 10.10.10.1 & if a packet with a destination
10.10.10.1 that comes from the inside interface , the source will be nated
to 20.20.20.1

So what is the difference between the above two configurations

Thanks In Advance

Regards,

Blogs and organic groups at http://www.ccie.net

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