5Either:

■Enter the additional services that you wish to allow in the except (specify ports) box and set the drop down box to Allow.

■Enter the services that you wish to deny in the except (specify ports) box and set the drop down box to Deny.

Enter multiple ports as either a comma separated list e.g. 101, 105, 107, or as a range, e.g. 101-107.

6Click Apply to save the settings.

Example: Allowing only web and E-mail access.

To allow web and E-mail access and block all other services across the Gateway’s firewall:

■Ensure that the Control PC Access to the Internet radio button is selected.

■Click on All PCs to pop up the PC Privileges window.

■Ensure that the Email (110,25) and Web (80) boxes are checked and that other check-boxes are left cleared.

■Set the Block or Allow other services: drop-down box to Block other services.

For the purposes of this example, your users also need to access a test web server on port 8080. To allow this:

■Enter the number 8080 in the except (specify ports): box.

■Click Apply to save your changes and close the PC Privileges window.

VPN connections to other networks are unaffected by settings in PC Privileges. To allow or deny VPN connections to other networks see “Configuring VPNs” on page 53.

Special Applications

Select Special Applications tab to display the Authorized Application setup screen. See Figure 47 below.

Figure 47 Special Applications Screen

Some software applications need a connection to be started from the Internet — an act that is usually blocked by the Gateway’s firewall.

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3Com 3CR856-95 manual Special Applications Screen
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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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