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Relationship between NAT & Routing Tables

techguy
Level 4
Level 4

‎12-15-2014 12:39 AM - edited ‎03-05-2019 12:22 AM

Hi All,

 

Can some explain me whats the relationship between nat and routing table. How they behave when both must execute? Whats the preference (which one is matched first)?

 

 

Thanks

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milan.kulik
Level 10
Level 10

‎12-15-2014 04:59 AM

Hi, this table might help you: http://www.cisco.com/c/en/us/support/docs/ip/network-address-translation-nat/6209-5.html Best regards. Milan
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techguy
Level 4
Level 4
In response to milan.kulik

‎12-15-2014 08:31 PM

i mean to say when a packet arrives in router first it sees a routing table or natting table. 

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milan.kulik
Level 10
Level 10
In response to techguy

‎12-15-2014 11:44 PM

Hi, as you can see in the table I referrred to, it depends. When a packet comes on an interface configured as an inside one (by the NAT configuration), policy routing and routing is processed first followed by NAT. When a packet comes on an outside interface, NAT is prcessed first followed by routing. Is it clearer now? Best regards, Milan
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