13.25 NAT with overlapping subnets

 

I understand the concept and I have it working with the SG config.

I used the DOC_CD for help with my solution (http://www.cisco.com/en/US/docs/ios-xml/ios/ipaddr_nat/configuration/12-4t/iadnat-addr-consv.html#GUID-06602E11-5D4C-4F35-AEED-86F470A69367) and it was slightly different and it did not work, I used for the inside nat:

ip nat inside source list 1 pool NET_11

Access list 1 =

permit 10.0.0.0 0.0.0.255

and the pool =

ip nat pool NET_11 11.0.0.1 11.0.0.254 prefix-length 24

The SG guide uses :

ip nat inside static network 10.0.0.0 11.0.0.0 /24.

Does anyone know what the difference is between the inside NAT statements and why does mine not work?

 

Comments

  • ip nat inside source list 1 pool NET_11

    Access list 1 =

    permit 10.0.0.0 0.0.0.255

    and the pool =

    ip nat pool NET_11 11.0.0.1 11.0.0.254 prefix-length 24

    The SG guide uses :

    ip nat inside static network 10.0.0.0 11.0.0.0 /24.

    Does anyone know what the difference is between the inside NAT statements and why does mine not work?

    Hi,

    The translation you are doing is dynamic. I don't see any issue with it since you have correctly created the access-list and mapped it with the pool  which is also correct. Did you try sending some traffic over the path? If you didn't, dynamic NAT wouldn't show the translation hits in the table.

    Hope this helps!

  • Hi Hari

    Yes when I ping from R2 using loopback 1 I get :

    Rack1R1(config)#
    *Mar  2 17:18:57.301: ICMP: dst (11.0.0.1) host unreachable sent to 10.0.0.2
    Rack1R1(config)#no
    *Mar  2 17:18:59.300: ICMP: dst (11.0.0.1) host unreachable sent to 10.0.0.2

    I'm glad you think it should work, I have been pulling my hair out on this one.

     

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