Configuring PATing on more than one router interface

Unanswered Question
Feb 28th, 2007

Hi,

Can I configure PATing using the keyword "overload" on more than one router interface; when trying to configure more than one NAT rule using the keyword "overload" it gives an error that dynamics NATing is already in use.

Regards,

Haitham

I have this problem too.
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dradhika Wed, 02/28/2007 - 23:13

Hi Haitham,

Yes you can use it on more than one interface.

'dynamics NATing is already in use' is unsually given when you are trying to change a rule from which the ip address is already in use.

Were you trying to give a different interface for the same access list?

Normally for one access-list you can use only a single interface.

Let me know if you were trying something different.

Thanks,

Radhika

haithamnofal Wed, 02/28/2007 - 23:45

Hi Radhika,

What I meant will be clearer when I give this senario and then let me know if what you mentioned in your post is applicable here or not:

interface FastEthernet0/0

ip address *.*.*.*

ip nat outside

duplex auto

speed auto

interface FastEthernet0/1

ip address *.*.*.*

ip nat outside

duplex auto

speed auto

interface FastEthernet0/2

ip address *.*.*.*

ip nat inside

duplex auto

speed auto

access-list 1 permit any

ip nat inside source list 1 interface FastEthernet0/0 overload

Now, when I try to enter the command:

ip nat inside source list 1 interface FastEthernet0/1 overload

I receive an error reading that dynamic NAT is already in use. I need to have dynamic NAT enabled on both fa0/0 and 0/1 because I am load balancing between the 2 link. Can you please clarify your point in your previous post based on my scenario?

Thanks,

Haitham

dradhika Thu, 03/01/2007 - 06:04

Hi Haitham,

I can think of the following solution.

Try creating two extended access-lists,

Access-list one includes networks from f0/2 to f0/0 and access-list two includes networks from f0/2 to f0/1

now you can create two dynamic rules,

ip nat inside source list one interface f0/0 overload

ip nat inside source list two interface f0/1 overload

Now when the traffic goes through f0/0 its ip address will be used and when the traffic goes from f0/1 its ip address will be used.

Hope this helps,

Radhika

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