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VT2542 Voice Gateway User Guide
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Overview
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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.
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VT2542 Voice Gateway User Guide
29
Overview
Installation
Troubleshooting
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.
Page 43 / 87
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
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VT2542 Voice Gateway User Guide
31
Overview
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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.
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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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