VT2542 Voice Gateway User Guide

28

Overview

Installation

Troubleshooting

Contact

FAQ

Glossary

License

Configuration:

Basic

Advanced

TCP/IP

Wireless

Custom Port Forwarding

You can create up to 20 custom port forwarding entries to support specific services or applications, such as

concurrent NAT/NAPT operation.

Custom Port Forwarding fields

Field

Description

Enable

It is selected by default and automatically applies when you click

Apply

.

Application

The name of the application for which ports are opened.

Protocol

Can be TCP, UDP and TCP, or UDP.

Source IP Address

Sets the source IP address from which incoming traffic is allowed.

Source Netmask

Sets a subnet mask used in conjunction with the Source IP Address to set a range of IP

addresses. Enter

0.0.0.0

for all.

Destination IP Address

The LAN’s destination IP address for incoming traffic.

Destination Netmask

Subnet mask used in conjunction with the Destination IP Address to set a range of IP

addresses. The default is 255.255.255.255.

Destination Port Start

The starting port number that is opened for this application.

Destination Port End

The ending port number that is opened for this application.

Destination Port Map

Destination port mapped on the LAN (destination) side to which packets are forwarded.

There are two types of port mapping:

• One-to-one (one port mapped to one) (WAN = 500 to 600; LAN = 500 to 600)

• Multiple-to-one (several ports mapped to one) (WAN = 500 to 600; LAN = 700)

Wildcard (*) entries are allowed for the IP Address, Netmask, and Port range fields.

VT2542 Voice Gateway User Guide

29

Overview

Installation

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Contact

FAQ

Glossary

License

Configuration:

Basic

Advanced

TCP/IP

Wireless

IP Filters

IP filtering enables you to block applications and services based on the IP address of a LAN device. You can apply

one or more predefined IP filtering rules to one or more LAN computers. You can view the rules associated with a

predefined filter and add the available rules for a given category. You can also create, edit, or delete your own IP

filter rules.

IP Filters fields and buttons

Field or Button

Description

LAN IP

The IP address in the LAN group to which the IP filters are applied.

New IP

Displays the

LAN Clients

page.

Block All Traffic

If selected, network access is blocked for the IP address.

Block Outgoing

Ping

If selected, outgoing pings are blocked for the IP address. Blocking outgoing pings can be useful

if a computer has a virus that attempts a Ping-of-Death denial of service attack.

Custom IP Filters

Displays the

Custom IP Filters

page

Category

Sets the category for which rules are displayed in the Available Rules list — Games, VPN, Audio/

Video, Apps (applications), Servers, or User (custom rules you can define and edit).

Available Rules

Predefined and user-defined IP filtering rules for each category.

View

Displays the settings for the selected Available Rule.

Add

Adds the selected Available Rule to the Applied Rules list.

Remove

Removes the selected rule from the Applied Rules list.

Applied Rules

Lists the IP filtering rules selected for the category.

VT2542 Voice Gateway User Guide

30

Overview

Installation

Troubleshooting

Contact

FAQ

Glossary

License

Configuration:

Basic

Advanced

TCP/IP

Wireless

Custom IP Filters

You can define up to 20 custom filters to block services or applications based on the source and destination IP

address, subnet mask, TCP port, and protocol.

Custom IP Filters fields

Field

Description

Filter Name

The IP filter rule name

Enable

Selected by default and automatically applied when you click

Save

Source IP

The LAN source IP address assigned to outgoing traffic on which filtering is applied

Source Netmask

Subnet mask of the source IP address

Destination IP

Sets the destination IP address to which your source IP address is denied access

Destination Netmask

Subnet mask of the destination IP address. Enter

0.0.0.0

for all

Port Start

The starting port number that will be blocked for this application

Port End

The ending port number that will be blocked for this application

Protocol

The options are TCP, UDP, TCP and UDP, ICMP, or Any

VT2542 Voice Gateway User Guide

31

Overview

Installation

Troubleshooting

Contact

FAQ

Glossary

License

Configuration:

Basic

Advanced

TCP/IP

Wireless

LAN Clients

The LAN Clients window displays all computers on your network. For each computer on your LAN, you can do

one

of:

•

Allow it to dynamically (automatically) obtain its IP address from the voice gateway through a DHCP lease

from the DHCP server on the VT2542 (the default)

•

Allow it to dynamically obtain its IP address from a DHCP server on another router on the network

•

Manually assign it a static IP address in the voice gateway LAN subnet address range

LAN Clients fields

Field

Description

Enter IP Address

Type the static IP address to assign to the computer or other host. For that host, type its

Hostname

(optional) and

MAC address

(required).

Dynamic Addresses

Lists the currently assigned dynamic IP addresses and the hostname, MAC address, and

address Type (always Dynamic in this table) of the assigned computer.

To assign a dynamic IP address to the computer as a static IP address, select

Reserve

.

Static Addresses

(Not shown above.) If any static IP addresses are reserved, lists them and the host name, MAC

address, and address Type (always Static in this table) of the assigned computer.

To remove a static IP address assignment from a computer, select

Delete

. If you delete a static

IP address entry, it is made available for future allocation.

VT2542 Voice Gateway User Guide

32

Overview

Installation

Troubleshooting

Contact

FAQ

Glossary

License

Configuration:

Basic

Advanced

TCP/IP

Wireless

Web Filters

Web Filters enable you to manage the type of web content that passes through your voice gateway:

Web Filters fields

Field

Description

Proxy

Disabled by default.

Cookies

Disabled by default.

Java Applets

Disabled by default.

ActiveX

Disabled by default.

Pop-Ups

Disabled by default.

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