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

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
Jo CoxAsked:
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Nayyar HH (CCIE RS)Network ArchitectCommented:
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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Jo CoxAuthor Commented:
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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Nayyar HH (CCIE RS)Network ArchitectCommented:
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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Jo CoxAuthor Commented:
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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Nayyar HH (CCIE RS)Network ArchitectCommented:
Pleasure :-)
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