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Setting up NAT on a Cisco 2500 router

By bdgraves ·
I need to change from public IP addresses to private IP address within our LAN (running out of public addresses). I must retain access to the internet for all users. I'm using a Cisco 2504 router and I know it has the capacity of using NAT. How is this set up?

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Setting up NAT on a Cisco 2500 router

by steve.smith In reply to Setting up NAT on a Cisco ...

Setting up NAT is much easier than people think. You are assigning a set of addresses to be used if specific traffic exits or enters a specific interface. There are 2 ways to assign NAT...Static which is a 1 to 1 relationship with a node/host, or dynamic which pulls an available address from a pool of resources. Below are the commands..
Global config#
ip nat pool net-1 177.16.1.2 177.16.1.25 netmask 255.255.255.255
(this creates a pool of private address to use)
ip nat inside source list 1net-1 overload
(overload enables PAT if needed)
ip nat inside source static 10.1.1.1 177.16.1.1
( this example is a 1 to 1 static)
(Below defines which interfaces to use)
int E0
ip nat inside
int S0
ip nat outside
#feel free to email me if you have questions

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Setting up NAT on a Cisco 2500 router

by bdgraves In reply to Setting up NAT on a Cisco ...

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Setting up NAT on a Cisco 2500 router

by csyeo In reply to Setting up NAT on a Cisco ...

You need hv at least the plus feature set ios on your router,you can check by doing a
issusing a "show version" command.Look out on the second line of the output and you will something like this"IOS (tm) 2500 Software (C2500-DS-L), Version 11.2(15a)" where c2500 tel you the platform and DS tell you the ios type.the configuration will be as below,

ip nat pool test 150.100.14.17 150.100.14.30 netmask 255.255.255.240<--public address
ip nat inside source list 1 pool test
access-list 1 permit172.16.1.0 0.0.0.7<-private address
interface token 0
ip nat inside
interface serial 0<--change to int bri0 or serial 1 accordingly
ip nat outside

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Setting up NAT on a Cisco 2500 router

by bdgraves In reply to Setting up NAT on a Cisco ...

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Setting up NAT on a Cisco 2500 router

by bdgraves In reply to Setting up NAT on a Cisco ...

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