AddPac VoiceFinder AP2120 User's Guide download pdf (Page 105)

VoiceFinder AP2120 VoIP Gateway User’s Guide Version 1.00

AddPac Technology Co., Ltd. -

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4.7. NAT(Network Address Translation) Configuration

One of problems of the Internet is that number of available IP addresses is

decreasing. The Network Address Translation (NAT) changes uncertified

address that is used in the inside network into another IP address (usually,

registered address) when the address goes outside. Also, when a registered IP

address comes to the inside network from outside, NAT changes it into an

internal IP address.

NAT can be useful for the following cases:

z When the user wants to use Internet but the user cannot have a unique,

public address. In this case, NAT connects the private IP network that uses

an unregistered IP address with the global Internet.

NAT shall be set in the Gateway that is located in the boarder between the

public network (usually called an outside network) such as the Internet and

the stub domain (usually called an inside network.) Before sending packets

to outside networks, NAT converts internal private IP address into unique IP

address.

z When the manager needs to change inside network address for the

security reason or other reasons. In this case, without changing IP address

that is a lot of work, the manager can translate addresses with NAT.

z When the manager needs to distribute TCP traffic for load-sharing. In this

case, the manager can map several local IP addresses into one global IP

address with the TCP load distribution function. When users access to the

network from outside, they need to use the global IP address to access to

the network and pass through the Gateway. Through the TCP session,

load distribution is possible.

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AddPac VoiceFinder AP2120 User's Guide Page 105