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What does ip nat inside source list 111 interface Dialer0 overload actually do

Posted on 2012-03-28
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Last Modified: 2012-03-28
Hi
Can anyone fill me in on exactly what this ip nat statement actually does on my cisco 1721?

ip nat inside source list 111 interface Dialer0 overload

access-list 111 deny   ip any 192.0.0.0 0.255.255.255
access-list 111 permit ip 192.168.18.0 0.0.0.255 any
access-list 111 permit ip 10.18.2.0 0.0.0.255 any
access-list 111 permit ip 10.18.1.0 0.0.0.255 any

TIA
Jo
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Question by:jrb139
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5 Comments
 
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Expert Comment

by:Nayyar HH (CCIE RS)
ID: 37775569
In basic terms, It will translate all your source addresses matched by the criteria in access-list 111 to the address of the dialer interface
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Author Comment

by:jrb139
ID: 37775587
Does that mean
access-list 111 deny   ip any 192.0.0.0 0.255.255.255
will not get translated and thus its source address in the packet will remain as it was when originally sent from the device?

And the overload command, any particular meaning?
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Accepted Solution

by:
Nayyar HH (CCIE RS) earned 500 total points
ID: 37775617
yes that's right condition matching "access-list 111 deny   ip any 192.0.0.0 0.255.255.255" will not get translated and will be routed

The overload statement enables the router to use the ONE IP address on the dialer interface for MANY inside addresses
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Author Closing Comment

by:jrb139
ID: 37775975
Perfect
No longer do I have to sit and stare thinking 'What' but can move on to other lines of code to think 'What' about.
Thank you
Jo
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LVL 15

Expert Comment

by:Nayyar HH (CCIE RS)
ID: 37776296
Pleasure :-)
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