Cisco Router Nat
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A Cisco router performing NAT divides its universe into the inside and the outside . Typically the inside is a private enterprise, and the outside is the public Internet . In addition to the notion of inside and outside, a Cisco NAT router classifies addresses as either local or global .
Some of the reasons you would need NAT on a Cisco router would be: Inside to Outside . Static NAT translating inside private IP to outside public IP . example: assigning outside, public IP to internal web server . Outside to Inside . Translating outside public IP to inside private IP .
This document explains configuring Network Address Translation ( NAT ) on a Cisco router for use in common network scenarios . The target audience of this document is first time NAT users . Note: In this document, when the internet, or an internet device is referred to, it means a device on any external network . Prerequisites Requirements
The first step to configuring NAT on any Cisco IOS router is designating which interfaces should be considered " Inside " and which should be considered " Outside " . It is easy to look at a network topology diagram to determine which interfaces are facing the Internet and which interfaces are facing the internal servers .
Cisco software can selectively or dynamically perform NAT . This flexibility allows network administrator to use a mix of RFC 1597 and RFC 1918 addresses or registered addresses . NAT is designed for use on a variety of routers for IP address simplification and conservation .
The route to the destination network must be known through an interface that is defined as NAT outside in the router configuration . It is important to note that the return packets are translated before they are routed . Therefore, the NAT router must also have a valid route for the Inside local address in its routing table . Related Information
This flexibility allows the network administrator to use a mix of RFC 1597 and RFC 1918 addresses or registered addresses . NAT is designed for use on various devices for IP address simplification and conservation . In addition, Cisco IOS XE NAT allows the selection of internal hosts that are available for NAT .
Due to the fact that your consumer based modem/ router is doing NAT OVERLOAD, and it's not configurable meaning you can't change the parameters, you need to configure Dynamic NAT on the 2600 as well . This is due to the fact that the modem/ router is only translating the 192 .168 . . 0 .0 .0 .255 range to the public IP address .
How to Configure Static NAT on Cisco Router . With static NAT , when a computer on the local network sends a packet to the port of an external or optional interface, it maps the destination IP address to a port behind the firewall . This means that each computer on the private network must have a public IP address assigned to access the Internet .
My basic configuration is the Cisco router providing access to the internet and all NAT translations are done on it . I have a wireless Linksys router connected to the Cisco router over which I connect my laptop and other devices that need to access my servers internally over the public IP address from the laptop .
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Cisco Router Nat
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