Getting NAT correct on a 6509

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Mar 12th, 2007
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I need a little NAT advice. I am routing between 2 internal vlans, and .64/24. I need to NAT these 2 vlans to the outside/public vlan 165.x.x.x. Here is the config I have come up wth :

ip nat pool niscpool 165.x.x.105 165.x.x.105 prefix 24

access-list 1 permit

access-list 1 permit

ip nat inside source list 1 pool niscpool overload

interface vlan 1

ip nat outside

interface vlan 3

ip nat inside

interface vlan 4

ip nat inside

Will this work? Any suggestions?


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ssoberlik Fri, 03/16/2007 - 11:50
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If you are planning to implement NAT with Cat6509 supervisor itself, then you cannot go for 2 inside interfaec. Cisco IOS does not allow that configuration.

Refer to

But you can implement this scenario with Firewall module FWSM.

You can configure multiple SVIs to be part of the 'inside' interface.

Jon Marshall Fri, 03/16/2007 - 15:33
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Is this a limitation of the 6500 or the IOS.

As far as i am aware there is nothing to stop you applying the "ip nat inside" statement to more than one interface in IOS.



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