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COnfiguring NAT on Cisco 1800ISR

I have been evaluting a Cisco 1800ISR but I am not able to configure the NAT to work with a host from inside our network to an outside IP address. I have setup a test network in 192.168.x.x network and I am trying to NAT an unusde IP address from our internal network to the test network.

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New Member

Re: COnfiguring NAT on Cisco 1800ISR

Hello,

Here is a link to configure NAT:

http://www.cisco.com/warp/public/556/12.html

NAT ( Remember that you need to use a public ip address to enable the internal LAN to reach the Internet )

router>enable

router#config t

router(config)#ip nat inside source list 120 interface [name of the outisde

interface] overload

router(config)#access-list 120 permit ip [address of the LAN] [inverse mask

of the LAN ] any

router(config)#int [name of the interface ] <---LAN interface

router(config-if)#ip nat inside

router(config-if)#exit

router(config)#int [name of the interface ] <---INTERNET interface

router(config-if)#ip nat outside

router(config-if)#exit

If you have a internal server ( web, exchange for example ) that the

Internet will access you need to use static nat .

router>enable

router#config t

router(config)#ip nat inside source static x.x.x.x y.y.y.y <----where

x.x.x.x is the internal ip and y.y.y.y is the public ip

router(config)#exit

Here are some more useful links related to NAT:

http://www.cisco.com/univercd/cc/td/doc/product/software/ios113ed/113ed_cr/d

ial_c/dcprt11/dcnat.htm#xtocid1349912

http://www.cisco.com/en/US/partner/tech/tk648/tk361/tk438/tech_protocol_home

.html

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