Problems configuring both static and dynamic NAT translations

[juan.saez]

Hi,

I have a router 4700 with a fastethernet interface (LAN) and a serial interface with leased line to our HeadOffice. Everybody that goes outside the LAN has to make NAT. I have configured dynamic NAT with a pool "ip nat pool p50200 10.99.101.1 10.99.101.255 netmask 255.255.255.0" but I have to configure static NAT for some addresses "10.99.101.101, 10.99.101.181, 10.99.101.208". The problem is that the NAT translation for "10.99.101.101, 10.99.101.181, 10.99.101.208" are duplicated.

I Know that the global addresses use in static translations are not automatically excluded with dynamic pools containing those global addresses but I don?t know how exclude that addresses from the pool.

Thank for your help.

Bye

[mark.edwards]

The static translations will take precedence over the dynamic pool.

[juan.saez]

I know it. The static translation is made perfectly but then the dynamic NAT assign the same address to other PC. The problem is that the same ip address is assigned to two different PC'S.

[dradhika]

Hi Jaun,

Try configuring pool as below

ip nat pool test netmask 255.255.255.0

Router(config)#ip nat pool test net 255.255.255.0

Router(config-ipnat-pool)#add 10.1.1.12 10.1.1.13

Router(config-ipnat-pool)#add 10.1.1.16 10.1.1.18

Make sure that the pool does not contain the ip addresses that you configured in the static rules

HTH,

Radhika