Listing a shows the resulting configuration for the router. Network address translation nat is a function by which ip. A cisco router performing nat divides its universe into the inside and the outside. Configuring nat network address translation cisco press. Rfc 3022 traditional ip network address translator traditional. Cisco rapt implementation is port address translation pat or nat. The main reason to use nat is to reduce the number. You are in charge of a router with hosts on a private network. The following figure illustrates a device that is translating a source address inside a network to a source address outside the network. Cisco 910 industrial router software configuration guide, release 1. This is a tutorial that shows how to configure network address translation nat on a cisco router.
Basic router configuration using cisco configuration. Using permit any can result in nat consuming too many router resources which can cause network problems notice in the previous configuration that only the first 32 addresses from subnet 10. In this cisco router tutorial, it author and speaker don r. There a few steps that are required when configuring static nat. Configure the nat function on the router to enable intranet users to access the internet. Router a is configured for nat, such that it translates the inside device to an address from the pool. The routers nat configuration remains the same, except for the addition of the ip. Auto nat and manual nat on cisco asa firewalls can be used to configure every. Console cables to configure the cisco ios devices via the console ports. Quick start steps for configuring and deploying nat. A router on that network has a private address in that address space. This includes the configuration of the ip address, default routing, static and dynamic routing, static and dynamic nating, hostname, banner, secret password, user accounts, and so forth. Another situation in which address conflicts might arise is the merger of two.
One way to ascertain this would be to have nat based on a border router that is. Abstract basic network address translation or basic nat is a method by which ip. Configure the switch as the dhcp server to assign ip addresses to users. Example for configuring a layer 3 switch to work with a router for. Example 424 shows the configuration steps for pool isp2, including the prompts. He has more than 10 years of experience in cisco networks, including planning, designing, and implementing large ip networks running igrp, eigrp, and ospf. Prerequisites for configuring nat for ip address conservation 4. One way to examine this on your router would be to issue the command show run. This tutorial explains basic concepts of nat network address translation protocol. An explanation of how this configuration helps with overlapping follows the.
Lab configuring dynamic and static nat topology addressing table. When the clients initiate traffic to the global ip of server, the traffic hits the nat router and. This document describes how to configure network address translation. Cisco asa nat configuration guide practical networking. For additional videos and white papers from west gate net. Network address translation nat is a method of remapping an ip address space into another. This document describes how to use the cisco configuration professional cisco cp in order to set the basic configuration of the router. Configuring nat on cisco routers stepbystep pat, static nat, port redirection. Cisco highly recommends that you do not configure access lists referenced by nat commands with permit any. This document demonstrates how you can use network address translation nat for overlapping networks. Lets see how to connect an office to the internet using a cisco router. How to configure nat on cisco router step by step with. The use of network address translation nat has been wide spread for.
In a typical configuration, a local network uses one of the designated private ip. In the past year, henry has focused on architectural design and implementation in cisco internal networks across australia and the asiapaci. Overlapping networks result when you assign an ip address to a device on your network that is already legally owned and assigned to a different device on the internet or outside network. Nat router between router a and router b enables the communication between overlapping ip network space. The device performs steps 2 to 5 for each packet it receives. Overlapping networks also result when two companies, both of whom use rfc 1918 ip addresses in their. Crawley shows you how to configure nat overloading, also known as port address translation or dynamic nat on a cisco router. The following steps describe how a device translates overlapping addresses. Router a is configured for nat, such that it translates the inside device to an address. Typically the inside is a private enterprise, and the outside is the public internet. This tutorial explains dynamic nat configuration creating an access list of ip addresses which need translation, creating a pool of available ip address, mapping access list with pool and defining inside and outside interfaces in detail. You may also use objectgroups, which are constructs that combine multiple. This document explains configuring network address translation nat on a cisco router for use in common network scenarios.
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