Specifications

VoiceFinder VoIP Gateway Configuration Guide (APOS 2.0) Release Version 3.1
AddPac Technology Co., LTD
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[NAT Acronyms]
z ip nat inside : This is the IP Address to be configured for the Host of the Inside Network
z ip nat outside : This is the IP address authorized from Network Information Center (NIC)
or Service Provider representing the inside Local IP Address to Outside Network.
z outside local address : This is the IP address of the Host in the Outside Network, which is
represented in the Inside Network. The public address is not needed, but should be
allocated the routing possible address.
z outside global address : This is the IP address which is allocated by the Host owner for the
host in the Outside Network. The address is allocated to the globally routing possible
address or network.
NAT has Static Address Translation and Dynamic Address Translation.
z Static Address Translation : When an access is requested from the Outside Network, this
address translation converts the public IP address to the private IP address statically. On the
other hand, when the inside host is accessed to the outside network, the reverse process is
taken.
z Dynamic address Translation : When an access is requested from Inside Network to
Outside Network, an unused public IP address is assigned from the IP address pool. If all
the procured IP addresses are in use, the inside network can not allow any more access to
the outside.
VoiceFinder Gateway supports both NAT, which translates many inside private IP addresses to
the outside public IP address, and PAT (Port Address Translation) feature that translates many
private IP address to the protocol numbers above the one single outside public IP address.
Interface PAT enables VoiceFinder Gateway to use DHCP of Cable Modem or PPPoE of ADSL
environment dynamically. When PAT static entry is specified, not only a specific port, but also
a constant port range can be connected to a specific host, which has been designed to be