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Help with the ip nat pool command

hammadjghanghro
Level 1
Level 1

Can someone please explain to me the use of 'nopreservation' keyword in the 'ip nat pool' command?

1 RESPUESTA 1

bzendeja
Cisco Employee
Cisco Employee

Hi Hammad,

The "nopreservation" keyword enables all the IP addresses in the pool to be used for dynamic translation.

Comparisons with option turned on and off:

===================================

a) option on:

ip nat pool test 10.0.0.1 10.0.0.2 prefix-length 24 nopreservation

c1841-7#sh ip nat tr

Pro Inside global      Inside local       Outside local      Outside global

53  10.0.0.2:0     25.1.1.13:0        14.1.1.11:0        14.1.1.11:0

--- 10.0.0.2       25.1.1.13          ---                ---

53  10.0.0.1:0     25.1.1.14:0        14.1.1.11:0        14.1.1.11:0

--- 10.0.0.1       25.1.1.14          ---                ---

The above shows that the first nat pool address is available for nat translation.

Or:

c1841-7#sh ip nat tr

Pro Inside global      Inside local       Outside local      Outside global

udp 10.0.0.2:6300  25.1.1.13:6300     14.1.1.11:6300     14.1.1.11:6300

53  10.0.0.1:0     25.1.1.14:0        14.1.1.11:0        14.1.1.11:0

--- 10.0.0.1       25.1.1.14          ---                ---

The above shows that the first nat pool address is available for nat translation.

a) option off:

ip nat pool test 10.0.0.1 10.0.0.2 prefix-length 24

c1841-7#sh ip nat tr

Pro Inside global      Inside local       Outside local      Outside global

udp 10.0.0.2:6300  25.1.1.13:6300     14.1.1.11:6300     14.1.1.11:6300

The above shows that the first nat pool address is not available for nat translation of packets with ip unknown protocols.

Please let me know if this information helps you.

Regards,

Bernardo