So that these special applications can work properly and are not blocked, the firewall needs to be told about them. In each instance there will be an outgoing trigger which tells the Gateway’s firewall that the application has started and to allow the incoming connections.

Each defined Special Application only supports a single computer user and any incoming ports opened by a Special Application trigger will be closed after 20 minutes of inactivity for TCP/IP connections or 10 for UDP/IP connections.

For each special application configured by the Gateway, a row is added to the table. Each row contains the following items:

■Delete button — Deletes the special application on that row. This will prevent the Gateway’s firewall from opening to that connection.

■Name — Each special application is named. This name is not used by the Gateway and is only to enable you to identify the connection. Clicking the name of a connection displays the Special Application Setup screen. See “Adding and Editing Special Applications” below.

■Trigger Port — This is the TCP/IP port number that the Gateway uses to recognize that the application has started.

Additionally there are two buttons outside the table:

■Help — displays the online help page for this screen.

■New — creates a new special application. See “Adding and Editing Special Applications” below.

Adding and Editing Special Applications

1Click on the New button to create a new special application or on the name of a special application to edit the settings for that application.

Figure 48 Special Application Settings Screen

2Select the applications from the Choose Application drop-down box. See Figure 48. If the application you want to define is not in the list select Custom and see “Creating Custom Special Applications” below.

3Click Add to add the special application to the list of protocols or Close to abort your selection and return to the Special Applications screen.

Depending on the settings you have made in PC Privileges the Special Application you have defined may not be allowed across the Firewall. See “PC Privileges” on page 47.

Creating Custom Special Applications

If your special application is not listed in the Choose Application drop-down box you can still configure it manually. Select Custom from the Choose Application drop-down box and the Special Application Setup Screen gains the extra fields needed to describe a custom special application. These are shown in Figure 49 below.

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3Com 3CR856-95 manual Adding and Editing Special Applications, Creating Custom Special Applications
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3CR856-95 specifications

The 3Com 3CR856-95 is a versatile networking device designed to meet the demands of small to medium-sized businesses. As a part of the 3Com OfficeConnect series, the 3CR856-95 combines switching, routing, and security features into a compact, integrated solution that enhances network performance and reliability.

One of the main features of the 3CR856-95 is its ability to support multiple network configurations. It operates as a router and switch simultaneously, offering six Ethernet ports for wired connections, while also integrating wireless capabilities. This allows businesses to connect various devices seamlessly, including computers, printers, and smartphones, providing flexibility and convenience in a modern office environment.

The device incorporates advanced technologies such as Quality of Service (QoS) which prioritizes network traffic to ensure that bandwidth-intensive applications like video conferencing and VoIP run smoothly. This feature is essential for maintaining productivity and communication efficiency in busy office settings. Additionally, the 3CR856-95 supports both IPv4 and IPv6 protocols, making it a future-proof solution as businesses transition to the newer Internet Protocol standard.

Security is a critical consideration for any networking equipment, and the 3CR856-95 addresses this with robust measures. It includes a built-in firewall that protects the network from external threats, along with support for Virtual Private Networks (VPN), allowing secure remote access for employees working from off-site locations. Furthermore, the device supports WPA2 encryption for wireless connections, safeguarding sensitive data transmitted over the network.

Another important characteristic of the 3CR856-95 is its user-friendly interface, which simplifies the setup and management of the network. The device features a web-based management console that allows network administrators to easily configure settings, monitor traffic, and troubleshoot issues from any internet-connected device. This accessibility saves time and reduces the complexity often associated with network management.

In summary, the 3Com 3CR856-95 is a robust and feature-rich networking solution tailored for small to medium-sized businesses. With its combination of switching, routing, and security features, it provides a reliable platform for facilitating seamless communication and connectivity. Its support for advanced technologies and user-friendly management interface makes it a smart choice for organizations looking to enhance their network infrastructure.
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