Setting up One-to-One NAT

The following criteria must be met to be able to use One-to-One NAT:

■You must have a static Internet IP address for every computer on your network plus one for the Gateway itself.

■The addresses must be in one continuous block in the same subnet

■You must have selected Static IP Address as your IP Allocation Mode and have given your Gateway the first of the Internet addresses allocated by your ISP.

Figure 40 One-to-One NAT Screen

To set up One-to-One NAT:

1Select One-to-One NAT from the NAT Mode drop-down box.

2Enter the second address of your Internet range of addresses in the First IP Address in ISP Pool field.

3Enter the first address in your LAN range of addresses to which you want to map this range in the First IP Address in LAN Pool field.

3Com recommends that you set your DHCP pool to the same as the range of LAN addresses used as your LAN pool.

4Enter the number of addresses in the range into the Pool Size field.

5Click Apply to save your changes.

Configuring the Firewall

On the main frame of the Firewall setup screen is a menu with four tabs: Virtual Servers, PC Privileges, Special Applications, and Advanced. These enable you to set the access to and security of your network.

The Virtual Servers Menu

Selecting the Firewall option on the main menu displays the Virtual Servers screen. (Figure 41)

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3Com 3CR856-95 manual Configuring the Firewall, Virtual Servers Menu, Setting up One-to-One NAT
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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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