Home and small office networks can be set up in a variety of configurations. For suggestions or review, call Giga Network Services [http://www.giganetworkservices.com] at 408 828 5550.
The following factors can affect your network setup:
- Equipment availability and cost
- Internet access availability
- Configuration simplicity
- The environment of the network
- Security for the Internet connection
- Preferences and knowledge of installer
The Internal Network
To provide connectivity between all the computers in your home or small office, the computers of the internal network must be either directly or indirectly connected to each other.
You must also choose a type of networking technology, sometimes referred to as the LAN media, which enables your computers to send information to each other. The most common networking technologies used for home networking include:
Used in organization networks, Ethernet is widely known, supported, and understood. Ethernet equipment consists of an Ethernet adapter and either coaxial cable (for 10Base2) to serially connect each computer together, or twisted pair cable (for 10BaseT or 100BaseT) to connect each computer to a hub. A hub is required when you are using twisted pair cabling and connecting more than two 10BaseT or 100BaseT computers together.
While Ethernet adapters are generally low cost, the cabling and hub needs add to the complexity and cost.
Ethernet can operate at speeds of 10 megabits per second (Mbps) or 100 Mbps. To get 100 Mbps, you must use 100 Mbps Ethernet adapters, Category 5 twisted pair cabling, and connect to 100 Mbps port on an Ethernet hub.
Used mostly in home and small office networks, phoneline uses telephone wiring as its medium for communication and operates at speeds up to 10 Mbps. Phoneline equipment consists of a phoneline adapter installed in each computer and standard telephone cables connected to standard phone jacks.
The advantage of phoneline networks is phone jacks are usually found throughout the house and close to areas where computers are used.
Used in both organization and home networks, wireless technology uses radio signals to communicate so there is no cabling required. Wireless solutions are gaining popularity and becoming more affordable. There are many wireless products, however, wireless networks based on the IEEE 802.11 standard are becoming the preferred solution. Organization or large business wireless networks are more likely to be using IEEE 802.11. If your home or small network is also based on IEEE 802.11, you can use the same network adapter to access both work and home or small office networks. IEEE 802.11b can operate at a speed of 11 Mbps. Wireless equipment consists of a wireless adapter installed in each computer.
Connecting to the Internet
Typical external DSL or cable modem devices have an Ethernet port that you can use to connect it to an Ethernet hub. If you also connect your internal network computers to the same hub, then each computer can send and receive information directly to and from the Internet. This configuration is shown in Figure 5.
The disadvantages of setting up your network using this network configuration are the following:
- Security against Internet attacks must be maintained on each computer in your network. The computers running Windows XP should enable Internet Connection Firewall (ICF) (for Windows XP or Windows XP with Service Pack 1) on their Internet connection, Windows Firewall (for Windows XP with Service Pack 2), or a third-party firewall product. For computers running earlier versions of Windows, using another firewall is recommended.
- If ICF, Windows Firewall, or another firewall is not enabled on each Internet connection, by default, files and folders that are shared can be seen on the Internet. To prevent shared files and folders from being seen on the Internet, disable file and print sharing on the Internet Protocol (TCP/IP).
- If you are using ICF, Windows Firewall, or another firewall on each Internet connection, it might block file and printer sharing and the use of Universal Plug and Play devices between each computer in your internal network.
In both of the above cases in which file and printer sharing is disabled, to enable file and print sharing between computers in the local network, add the NWLink IPX/SPX NetBIOS Compatible Transport Protocol to your Internet connection or enable the File and Printer Sharing exception for Windows Firewall.
Using a Residential Gateway
A residential gateway is a hardware device that connects the home or small office network to the Internet. Similar to Windows XP Internet Connection Sharing (ICS), the residential gateway provides translation and allows you to share a DSL or cable modem Internet connection with all of the computers in your internal network. The residential gateway sits between your DSL or cable modem and internal network. Alternately, the DSL or cable modem might be integrated into the residential gateway. Figure 6 shows a residential gateway.
Residential gateways are also known as Internet gateways or broadband routers.
The advantages of using a residential gateway are the following:
- The residential gateway appears to the Internet as the only computer on the Internet, hiding the computers in your internal network.
- The residential gateway shares one Internet connection with all the computers in your network.
- One of your computers does not have to be on to provide Internet connectivity.
- You can utilize Universal Plug and Play in your home or small office.
The disadvantage of using a residential gateway is the additional cost of the residential gateway hardware.
Using a Host Computer
A host computer is a computer running Windows XP that is connected to both the Internet and the internal network. The host computer acts as a gateway, providing connectivity between Internet and internal network hosts, and a firewall, providing protection from Internet attacks for the host computer and internal network computers.
Figure 7 shows an example of using a host computer when the internal network is using a single Ethernet LAN segment.
You can also use a host computer when the internal network is using phoneline, wireless, or a mixture of media.
The host computer is running Windows XP with the following features:
- Internet connection sharing (ICS) is enabled on the Internet connection.
- With ICS, the Internet connection is shared with all the other computers on the internal network. The host computer acts as a router, forwarding traffic between internal network and Internet hosts. Additionally, ICS protects internal network computers by discarding all traffic from the Internet that was not requested by an internal network computer. This prevents Internet attacks against internal network computers.
- Internet Connection Firewall (ICF) is enabled on the Internet interface or Windows Firewall is enabled.
While ICS protects internal network computers from Internet attacks, it does not protect the host computer. By enabling ICF on the Internet interface or enabling Windows Firewall (for all interfaces), Windows XP discards any traffic from the Internet that was not requested by the host computer. This helps protect the host computer from Internet attacks.
The advantages of using Windows XP on a host computer are:
- Sharing one Internet connection with all the computers on your network can reduce the cost of connecting to the Internet and allows all the computers on your internal network to be online at the same time.
- The host computer appears to the Internet as the only computer on the Internet, hiding the computers in your internal network.
- The host computer with ICS and either ICF or Windows Firewall provides a level of security for your host computer and internal network computers.
- If your internal network has different types of LAN media, you can use the Network Bridge feature of Windows XP to automatically configure transparent bridging of the separate LAN segments.
- You can utilize Universal Plug and Play in your home or small office. With Universal Plug and Play you can control your Internet connection from any computer running Windows XP, Windows Millennium Edition, Windows 98 Second Edition, or Windows 98 in your internal network.
- Enabling ICF or Windows Firewall effectively disables file and print sharing on the Internet connection of the host computer. Therefore, private files stored on the host computer cannot be seen from the Internet. However, you can enable the File and Printer Sharing exception for Windows Firewall so that you can still use file and print sharing on your internal network.
- An additional device such as a residential gateway is not needed. You can use an existing computer on your internal network to act as the host computer.
The disadvantages of using the host computer are the following:
- The host computer must be on for the internal network computers to access the Internet.
- The host computer must have two network adapters installed(one to connect to the Internet and one to connect to the internal network.
If you are not required to use a residential gateway by your Internet service provider, connecting your internal network to the Internet using a host computer running Windows XP with ICS and either ICF or Windows Firewall provides a level of protection from Internet attacks and full connectivity between your internal network computers.
For a quick review and suggestions for network setup in your office, you can call us at 408 828 5550.
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