Avaya Router - Network Address Translation BCM50 User Manual

BCM50 Rls 6.0

Router - Network Address Translation (NAT)

Task Based Guide

Network Address Translation (NAT)

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Table of Contents

Network Address Translation (NAT) ................................ 5

Overview .................................................................................................. 5

BCM50 and NAT ...................................................................................... 5

BCM50 NAT Modes ........................................................................................... 6

Required Information ................................................................................ 7

Flow Chart ................................................................................................ 8

Accessing the Web Router GUI ................................................................ 9

From Element Manager ..................................................................................... 9

Access Directly via a Web Browser ................................................................. 14

NAT Configuration ................................................................ .................. 16

SUA Server ...................................................................................................... 16

Address Mapping ............................................................................................. 17

Trigger Port ...................................................................................................... 20

Avaya Documentation Links .......................................... 22

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Note: This guide relates to the BCM50a/ba and BCM50e/be models only.

Note: Although the BCM50a/ba models will not be supplied with BCM 6.0, it is

possible to upgrade the variants of these models to BCM 6.0, if they were originally supplied with BCM50 R2 or BCM50 R3 software.

Note: The BCM50 Integrated Router is almost identical to the Business Secure Router (BSR) models. BCM50a/ba routers are based on the BSR252 and BCM50e/be routers are based on the BSR222.

Network Address Translation (NAT)

Overview

Many people view the Internet as a "one-way street"; they forget that while their computer is connected to the Internet, the Internet is also connected to their computer. That means that anybody with Net access can potentially access resources on their computers (such as files, email, company network etc). Most personal computer operating systems are not designed with security in mind, leaving them wide open to attacks from the Internet.

Network address translation (NAT) is a scheme that allows two connected networks (for example your Private LAN connected to the Internet) to use different and incompatible IP addressing schemes. Address translation allows hosts on a private internal network to transparently communicate with destinations on an external network or vice versa. In this way, NAT is being used as a security mechanism to hide the internal IP addresses. This also means that NAT allows the connecting of multiple computers to the Internet (or any other IP network) using one IP address, providing small businesses the means to connect their network to the Internet cheaply and efficiently.

BCM50 and NAT

The BCM50 Integrated Router enables a LAN network consisting of multiple computers to access the Internet, even though there may only be a single or a few WAN IP Addresses available. The process is roughly described as follows:

 A PC on the network makes a request for information from the Internet  The BCM50 Integrated Router keeps a track of IP and port information

for the outgoing packets, and replaces the source information with its own WAN information

 Returning packets are checked and the original IP and port information

is applied, to ensure that the packets return to the originator

BCM50 Integrated Router NAT is able to perform with either a single ISPallocated WAN IP address, or multiple ISP-allocated WAN IP addresses. If a

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single WAN IP Address is used, then the Single User Account (SUA) feature can be used. If multiple IP Addresses are used then the Full Feature NAT service can be used.

BCM50 NAT Modes

There are a total of five NAT modes on the BCM50 Integrated Router. Which modes you can use depends on the number of WAN IP Addresses have been issued by the ISP.

Single WAN IP Address

The following BCM50 Integrated Router NAT modes are supported for use with a single ISP-assigned WAN IP Address:

 Many-to-one: Many LAN Addresses are mapped to a single WAN IP

Address.

 SUA Server: Forwards external requests for certain services –

essentially ports – to specific LAN IP Addresses. An example of this would be an FTP Server (FTP uses port 21). External FTP requests can be forwarded to the FTP Server IP Address.

Note: For the SUA Server rules to function, Firewall rules need to be set up to allow e.g. FTP traffic through to the specified Server IP Address.

Multiple WAN IP Addresses

The following BCM50 Integrated Router NAT modes are supported for use with multiple ISP-assigned WAN IP Addresses:

 One-to-one: Maps a single unique LAN IP Address to a single unique

WAN IP Address. Only that LAN IP Address can access the Internet

 Many to Many Overload: LAN IP Addresses are mapped to multiple

WAN IP Addresses on a shared basis.

 Many one-to -one: Maps each unique LAN IP Address to each unique

WAN IP Address. You should ensure that there are as many WAN IP Addresses available as there are LAN IP Addresses that require external access.

Note: If the ISP assigns multiple WAN IP Addresses to the BCM50e/be/a/ba but you do not want to use more than one, the Many-to-one modes and SUA Server modes can still be employed.

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Required Information

Before configuring NAT, the following information is required:

 How many WAN IP Addresses will the BCM50 Integrated Router be

using?

 If using multiple WAN IP Addresses, will a mapping mode be used?  Are there any Servers on the network that need to be accessed from

the external network?

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