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1 modifying firewall settings, Advanced setup options, Odifying – Zoom IG-4160 User Manual

Page 27: Irewall, Ettings

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Chapter 4: Advanced Setup Options

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4

Advanced Setup Options

In addition to its basic setup options, the Zoom IG-4160

Internet Gateway includes options for specialized, or

advanced, settings. If you are like most users, you will not need

these options. Your Gateway is designed so that the basic

setup settings are sufficient for most users. This chapter is

applicable to you only if you need to perform sophisticated

tasks such as those listed below:

Modify the firewall to open up access portals to special

applications, such as games or videoconferencing.

Configure the LAN DHCP server.

Configure a Virtual Server.

Configure a DMZ Host.

Use a non-standard FTP port.

Configure LAN MAC Addresses.

Configure the Router Access Control option.

Use the WAN Ping Response Disable feature.

Use the Clone WAN MAC Address option.

4.1 Modifying Firewall Settings

If you want to use special applications such as certain Internet
games, videoconferencing, and Internet telephony, you often have

to use non-standard ports or multiple open ports. A port is an

endpoint to a logical connection; the port number identifies the

logical channel being used; for example, port 21 is associated with

FTP (File Transport Protocol). By definition, your Gateway’s

firewall prevents unauthorized access to any open ports. Some

applications require access to ports that your firewall would

normally deny. You must modify the Gateway’s firewall settings if
you want to accommodate these types of applications.