Avaya Business Secure Router 222 Configuration - Basics Instrukcja Użytkownika Pobierz pdf (Strona 133)

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Chapter 8 Network Address Translation (NAT) Screens 133

Nortel Business Secure Router 222 Configuration — Basics

How NAT works

Each packet has two addresses–a source address and a destination address. For

outgoing packets, the ILA (Inside Local Address) is the source address on the

LAN, and the IGA (Inside Global Address) is the source address on the WAN. For

incoming packets, the ILA is the destination address on the LAN, and the IGA is

the destination address on the WAN. NAT maps private (local) IP addresses to

globally unique ones required for communication with hosts on other networks. It

replaces the original IP source address (and TCP or UDP source port numbers for

Many-to-One and Many-to-Many Overload NAT mapping) in each packet and

then forwards it to the Internet. The Business Secure Router keeps track of the

original addresses and port numbers so incoming reply packets can have their

original values restored, as illustrated in Figure 34.

Figure 34 How NAT works

Port Restricted Cone NAT

The Business Secure Router uses port restricted cone NAT.

Port restricted cone NAT maps all requests from the same private IP address and

port to the same public IP address and port. A host on the Internet can only send a

packet to the private IP address and port if the private IP address and port has

previously sent a packet to that host’s IP address and port.

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