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IP Office Product Description

IP Office 4.2

Page 167

Issue 18.b.- (08 July 2008)

Network Address Translation (NAT)

Network Address Translation is a mechanism that allows you to use different IP address on your private

network behind a router with a public IP Address. When connecting to the Internet, ISPs typically want a

customer to use an IP address they have allocated. Using NAT this is easily accommodated, eradicating the

need for the customer to change their network numbering scheme and providing additional security to the

internal users as their address in hidden to the public.

Typically, a company maps its internal network addresses to a global external IP address and unmaps the

global IP address on incoming packets back into internal IP addresses. This helps ensure security since each

outgoing or incoming request must go through a translation process. This also offers the opportunity to qualify

or authenticate the request or match it to a previous request. NAT also conserves the number of global IP

addresses that a company needs.

Proxy Address Resolution Protocol (ARP)

Support for Proxy Address Resolution Protocol allows IP Office to respond on behalf of the IP address of a

device connected to it when receiving an ARP request.

Auto Connect

If a service is idle, that is no one is using the Internet, Auto Connect allows the IP Office to periodically

connect to a service. This is ideal for mail polling to retrieve email from an Internet Service Provider. An 'Auto

Connect Time Profile' controls the time period during which automatic calls are made, for example not at

weekends or during the middle of the night.

Firewall

IP Office integrated firewall provides packet filtering of the most common IP protocols including File Transfer

Protocol (FTP) and Internet browsing (HTTP). Each protocol passing through the firewall can be restricted/

allowed access in four different ways:

· Drop

No sessions via this protocol will be allowed through the wall

· In

An incoming session can "punch a hole" in the wall to allow traffic in both directions

· Out

An outgoing session can "punch a hole" in the wall to allow traffic in both directions

· Bothway

An incoming or outgoing sessions can "punch a hole" in the wall to allow traffic in both directions.

In cases where a protocol is not supported by default, the firewall can be customized to control packets based

on their content.

IP Office allows the configuration of as many firewalls as needed through IP Office Manager. This permits

different security regulations to be applied to individual dial-in users and data services.

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Reliant Octel 300 Spezifikationen Seite 167