Lan Internet Network
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 US Seller 15ft 5M Internet cable Ethernet Cat5e LAN Network Modem Patch Cable  US $3.99
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Protecting your LAN is no longer Optional
The ever-increasing threat presented by viruses and crackers necessitates a hard-line approach to controlling access to your data.
Your LAN is one of your most precious assets. In fact, all the information on it and all the information that passes through it can be thought of as the blood of your company. Not too long ago, your only method of protecting it was to make sure that any disks brought into the company weren't infected with viruses and to ensure that any disks leaving the company were safeguarded against your competitors.
Then came the Internet – a vast resource and an excellent medium for trading and communicating – and with it a populace of competitors, brazen crackers and people who enjoyed defacing property. Now that you're connected, there's a whole new game to play – a game that involves controlling who accesses what data. In short, you're looking at firewalls. So what exactly is a firewall and why do you need one?
The main function of a firewall is to keep out all the vandals and pirates while you get your work done. Quite simply, it is a system that enforces an access control policy between two networks, most notably the Internet and your LAN. Most companies, particularly large ones, should already have some sort of security in place. And if those organizations are connected to the Internet, then a firewall should be functioning as an important aspect of that security policy as a whole.
Although many companies considering Internet access are concerned about the violation of data and decreased employee productivity, there are ways to prevent this. And a firewall, developed as it is around concept of filtering your Internet traffic, is the best way to do this.
A firewall probably is best described as a two-way filtering system that controls which resources are permitted on your network and which are denied. For instance, you may not want to block external access to your web server where you perform advertising tasks and online commerce, and you probably don't want to block email as a resource. But, you do want to prevent unauthorized interactive logins from outside, and you may well want to prevent people on your network from browsing pornographic and gaming sites. Ultimately, your firewall controls the traffic coming in and the traffic going out.
In addition to that, your firewall provides you with an auditing tool, by which you can monitor all the traffic moving in and out of your network. The firewall should be able to provide the administrator with summaries of data including information such as the number of break-in attempts and from where they appear to come from. Essentially, your firewall is the last outpost on your network, and should anything go wrong, you should simply be able to pull the power and stop all network traffic between your LAN and the outside world.
The Ground Work
While all this may sound very neat and easy to implement, there are a number of considerations that should be taken into account before you kill the budget on a package that isn't really designed to meet your needs. Among these are firewall objectives which will help clarify what you need and how much you're willing to spend to meet that need.
The first thing you need to do is to outline your level of paranoia. Are you going to permit only mission critical Internet connections and deny all other services, or are you looking for a method of auditing and monitoring your connections? This should be seen as a method of establishing the risk factor involved in giving your LAN Internet connectivity. Once you have established this, you're in a position to draw up an implementation checklist that will outline which services you're going to permit and which you're going to deny.
You can also identify which services you're going to monitor and which will help you to clarify the focus of your network traffic. When this is done, you can develop a risk assessment of your policy with which your management should be happy. Finally, you need to establish the amount of control, monitoring, and maintenance that you're looking for, and with that down, you're ready to start browsing the marketplace for appropriate software.
Unfortunately, it's not as simple as browsing through a couple of boxes with pretty logos and then selecting the one with the gold-embossed brand name.
The Firewalls
Today, you're looking at two types of firewall. The first is the Network Layer Firewall which deals mostly with routing rules. In other words, when a packet of data arrives at the firewall it checks to see where it came from, where it is going, what it is used for, and then decides whether or not it is authorized.
The second is the Application Layer Firewall, which consists of proxy servers that prevent direct traffic between networks. Proxies tend to perform elaborate logging and auditing of all the network traffic intended to pass between the LAN and the Internet, and then cache information so that the client accesses it internally rather than directly from the source. Outgoing data is received from the proxy and not from the actual machine inside the network that is providing the information. Basically, an Application Layer Firewall acts as an ambassador for your LAN to the Internet.
Although the two firewalls are conceptually different, in an effort to provide a thorough product, many modern firewall packages do attempt to integrate the two. Obviously, there are pros and cons associated with each type of firewall.
A simple firewall exists in the form of a router on the network layer. However, actual routers don't tend to make particularly sophisticated decisions about the content or source of a data packet. Recently, firewalls of this nature have become far more complex, and now many attempt to monitor the actual content of data streams and the services they make use of, while also checking for IP or DNS (Domain Name Service) spoofing.
The most distinguishable feature of a Network Layer firewall is its ability to allow IP traffic to pass through it. Unfortunately, that your network is probably going to need an assigned IP address block which can be difficult to obtain. Fortunately, Network Layer Firewalls are almost completely transparent and anyone using your LAN will not even be aware of its presence.
From here, you can look at connecting various subnets all behind the firewall. And the only configuration that is going to take place is at the actual firewall itself. Since they are performing routing tasks rather than actually reading or writing data, or running services, the system requirements are minimal and they tend to run very fast.
A proxy server or Application Layer Firewall will be the only Internet connected machine on your LAN. For the rest of the machines connected to the proxy server, Internet connectivity is just simulated. There are several benefits to this; you can for instance, limit internal access to the Internet, identifying which sites your LAN may and may not visit, and what services your LAN can actually use. The caching service provided by the proxy also means that you're saving on bandwidth. Subsequently browsing popular web sites becomes a lot quicker.
As mentioned, proxies provide more than adequate logs. And because no other machines on the network are effectively connected to the Internet, you don't need valid IP addresses for every machine. So, Application Layer Firewalls are very effective for small office environments that are not connected with a leased line and have allocated IP address blocks. In fact, your proxy server can even perform dial-up connections on behalf of your LAN, and manage all your LAN's email and any other Internet requests.
The downside is quite dramatic, though. Since no traffic is allowed on to the Internet, any machine on the network that requires Internet access needs to be configured for the proxy. A proxy server hardly ever functions at a level completely transparent to your users. Furthermore, a proxy has to provide all the services that a user on the LAN uses, which means that you've got a lot of server-type software running for each request. This results in a slower performance than you would get out of a Network Layer Firewall. You're also looking at lots of RAM to match the system requirements. Furthermore, because proxy servers do not provide the same kind of flexibility as a Network Layer Firewall, they tend to enforce a relatively conservative security policy on your network.
Systems Management
Unix-based operating systems have always been the favorite for firewall implementation, chiefly because their system requirements are relatively low (therefore freeing up resources for the firewall itself). Unix platforms also support routing facilities and there have been significant developments in the production of high quality material on the network layer. And, a lot of it is free.
However, Unix systems are not particularly user-friendly, and configuring a firewall is not an easy task to undertake. If you're looking at this option you're also going to be looking for an experienced Unix technician.
Remember that to be really effective, your firewall needs to form part of both a comprehensive and integrated security policy. After all, it's no good having an iron door to a wooden house.
About the Author
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Yellow 4.8m RJ45 Ethernet Lan Internet Network Extension Cable $6.49 Description:Yellow 4.8m RJ45 Ethernet Lan Internet Network Extension CableThis RJ45 Network Cable is a handy cable when you need extra length to reach your device.High quality and great performance RJ45 Ethernet Lan Cable4.8m RJ45 Internet Cable is moulded and shieldedRJ45 Cable measured about 4.8m long8-pin RJ45 connectors at both endsCable color: yellowWeight: 123gPackage Components:1 piece of 4.8m RJ45 Ethernet Cable |
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RJ45 Ethernet Lan Internet Network Extension 2.8m Cable $4.49 Description:RJ45 Ethernet Lan Internet Network Extension 2.8m CableThis RJ45 Network Cable is a handy cable when you need extra length to reach your device.High quality and great performance RJ45 Ethernet Lan CableRJ45 Internet Cable is moulded and shieldedRj45 Extendion Cable measured about 2.8m long8-pin RJ45 connectors at both endsWeight: 73gPackage Components:1 piece of 2.8m RJ45 Ethernet Cable |
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Computer RJ45 Cat5 Lan Network Internet Ethernet Cable 1M $4.49 Description: This Cat5 Lan Internet Cable is a handy cable when you need extra length to reach your device. Connect to any hubs, PC or laptop for instant network connectivity. Good quality and great performance RJ45 Network Cable. Category 5 cable straight connected RJ45 crystal plug to RJ45 crystal plug. The Computer Lan Network Cable is moulded and shielded. 8-pin RJ45 connectors at both ends. Length: 1M, 39.4" Weight: 29g Package contains: 1 x 1M RJ45 Ethernet Cable |
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RJ45 Lan Internet Ethernet Cat5 Network Patch Cable 3M $5.49 Description:This RJ45 Internet Cable is a handy cable when you need extra length to reach your device.Connect to any hubs, PC or laptop for instant network connectivity.Good quality and great performance Ethernet Patch Cable.The Cat5 Network Cable is moulded and shielded.8-pin RJ45 connectors at both ends.Color: as photo shownLength: 3M, 118.1"Weight: 69gPackage contains:1 x 3M Lan Network Cable |
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PEGA USB LAN Adapter / Network Card for Wii $15.2 - Creates a high-speed LAN Internet connection for your Nintendo Wii- No wireless network required- Connects to your existing PC connection or DSL modem- USB 2.0 connection supports the Wii at full speed |
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1pcs USB to Ethernet RJ45 10/100 LAN Network Card Adapter (blue) free shipping $8.42 USB to Ethernet RJ45 10/100 LAN Network card, Connect your PC to internet with this USB network card |
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USB Internet LAN Network Adapter Connector For Wii New $12.99 1X USB 10/100Mbps Ethernet Network Adapter for Nintendo WiiInstantly creates an Ethernet connection from any USB port for faster and more reliable internet connection.Plug and Play. Easy installation.USB powered, no external power required.Connectors: 1 x RJ-45 jackIntegrated single chip fast ethernet Mac® controllerEliminate dropped or no signals from wireless networks.FeaturesCompliant with both USB 2.0 and USb 1.0 / 1.1 specifications10/100Mbps N-way auto negotiation operationInternet access via cable network for your Wii" / "Plugs into DSL, Cable Modem or RouterFaster connection than WiFiColor: GrayAccessory ONLY. Wii not included. Compatible With Nintendo: Wii Type: Wireless Adapter Features: This valued package includes : 1 X USB Ethernet Newtwork Adapter Item type : Aftermarket / Generic |
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RJ45 CAT6a Flat Ethernet Patch Network Lan Cable 15M $16.73 This CAT6a Lan Cable is designed for PC, Mac, Laptop, PS2, and XBox to hook up on high speed internet from DSL, Cable, T1, |
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Rocketfish LAN Adapter for Nintendo Wii $19.99 Get your Nintendo Wii system connected to the Internet with this LAN adapter. The adapter connects to your existing router with the included 6' Ethernet cable, creating a high-speed LAN Internet connection for your Wii via a USB 2.0 connection. Hop online with no wireless network required and maximize the fun of your Wii system. |
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USB Lan Network Adapter for Nintendo Wii $12.99 1X USB 10/100Mbps Ethernet Network Adapter for Nintendo WiiInstantly creates an Ethernet connection from any USB port for faster and more reliable internet connection.Plug and Play. Easy installation.USB powered, no external power required.Connectors: 1 x RJ-45 jackIntegrated single chip fast ethernet Mac® controllerEliminate dropped or no signals from wireless networks.FeaturesCompliant with both USB 2.0 and USb 1.0 / 1.1 specifications10/100Mbps N-way auto negotiation operationInternet access via cable network for your Wii" / "Plugs into DSL, Cable Modem or RouterFaster connection than WiFiColor: GrayAccessory ONLY. Wii not included. Compatible With Nintendo: Wii Type: Wireless Adapter Features: Compliant with both USB 2.0 and USb 1.0 / 1.1 specifications. 10/100Mbps N-way auto negotiation operation. Internet access via cable network for your Wii" / "Plugs into DSL, Cable Modem or Router. Faster connection than WiFi. Color: Gray. |
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CAT5 RJ45 Network Lan Splitter Plug $4.21 CAT5 RJ45 Network Lan Splitter Plug |
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CAT5e Ethernet Lan Network Cable 50 Feet $2.99 CAT5e Ethernet Lan Network Cable 50 Feet |
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USB Network Lan Adapter for Nintendo Wii $14.99 USB Network Lan Adapter for Nintendo Wii |
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Cisco / ON100 NETWORK AGENT LAN PORT / ON100-K9 $211.68 Cisco - ON100 NETWORK AGENT LAN PORT - ON100-K9 |
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3Com Wake on LAN Cable (For Network Card) Cblwol $4.98 3Com Wake on LAN Cable (For Network Card) Cblwol |
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SonicWall 4 x 10/100/1000Base-T Network LAN 01SSC7210 $2471.66 SonicWall 4 x 10/100/1000Base-T Network LAN 01SSC7210 |
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SonicWall 2 x 10/100/1000Base-T Network LAN 01SSC6063 $934.08 SonicWall 2 x 10/100/1000Base-T Network LAN 01SSC6063 |
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Wireless Lan 802.11n Pci Network 300mps $77.99 WIRELESS LAN 802.11N PCI NETWORK 300MPS |
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Tl-R402M - Tp-Link Tl-R402M 4-Port Cable/Dsl Router - 5 Port - 4 X 10/100Base-Tx Network Lan, 1 X 10/100Base-Tx Network Wan $31.44 tp-link's Tl-r402m is Designed For Small Oce / Home Oce (soho) Network Solutions. With Build-in Nat, Dhcp Server, Rewall And 4 Lan Ports, The Tl-r402m Will Allow You to Connect Your Network Better Than Ever, Sharing Internet Access, Les And Fun, Easily And Securely. share Resources And Simplify The Network the Built-in Four-port Switch Provides Computers on The Lan With Network Connectivity And Internet Access. Connect up to Four Pcs or Other Networking Devices to Access Home/company Resources And Use The Internet. [GD6207] UPC: 845973040093 UNSPC: 43222609 10.24L x 6.5W x 2.26H 0.49 LB |
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USB 10/100 Ethernet Network LAN Adapter RJ45 NIC $6.6 DESCRIPTION * Full speed USB interface to Desktop PC and Notebook * provided 10M/100M Ethernet port and connect to the internet or LAN * Auto sense the 10/100 Ethernet * Full and Half Duplex auto-negotiation for both 10BaseT and 100BaseT * USB 2.0 Compliant * Self Power, No external Power Required * Color may be varyRequirement * Available USB port * Microsoft Windows 98SE/ME/2000/XPPackage Contains * USB 10/100 Network Adapter * Driver CD |
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USB LAN Adapter for Wii $16.6 - Creates a high-speed LAN Internet connection for your Nintendo Wii- No wireless network required- Connects to your existing PC connection or DSL modem- USB 2.0 connection supports the Wii at full speedProduct description And measurementsThe Wii LAN adapter is required to connect the Wii console to a wired access point, such as a broadband modem or wired router.Product features:Requirements to connect the Wii console online with a wired connection.In order to connect the Wii console online with a wired connection, you will need following:-A Wii LAN adapter-An active broadband internet connection, such as DSL or Cable-A compatible internet service provider(ISP). some ISPs require a sign-in every time you connect online, or are otherwise incompatible. Contact your ISP for more information.-Either a broadband modem or wired router with an available ethernet port.-An ethernet cable.Item includes:1 x Wii LAN adapter1 x LAN adapter driver1 x User manualDimensions: 3.19 in x 1.38 in x 0.94 inWeight: 6.88 oz |
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Auna Musio WLAN / LAN-Internet Radio System with iPod Dock $94.9 Aunas Musio sound system brings you into the world of modern media! With an integrated iPod dock and an auxiliary input, this stylish system gives you plenty of options to connect several audio devices to the system.The futuristic device also provides Wi-Fi and LAN functionality, which enable the wired or wireless reception of 12,500 Internet radio stations. It can also be used as a network player to play MP3 music and other formats from your computer directly over the device. The extensive features are rounded off with an FM radio and a built-in alarm clock, making it perfect for small bedside desks or tables. With its compact dimensions, it's easy to move conveniently around your home without taking up large amounts of space. The Auna Musio can also be connected with an external stereo amplifier to boost its performance. Please note that the iPod pictured is not included. |
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Network Topology $105.14 Network Topology. Scalefree Network, Network Diagram, Computer Network, Motherboard, Ethernet, Open Shortest Path First, WiFi, Wireless LAN, Bluetooth, History of the Internet, Internet, ITUT. Author: Miller, Frederic P./ Vandome, Agnes F./ McBrewster, John Binding Type: Paperback Number of Pages: 144 Publication Date: 2009/11/03 Language: English Dimensions: 5.98 x 9.01 x 0.33 inches |
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LAN Wired Network Adapter for Wii Console (USB) $12.24 - Create a wired high-speed & reliable internet connection- Best choice to use this adapter where wireless connectivity isn't possible- Plug and play, Easy installation |
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NC600 Multi-user 100Mbps LAN Network Workstation Terminal $43 This workstation terminal works amazingly well for such a low price. Turn your Standard PC into a whole network of work stations. Standard with 3 USB slots, 1440*900 resolution speakers and microphone, it is unmatched in quality and features and it will work harder than your employees.Model: ZAP-NC600Cut computing costs by utilizing the untapped power of standard PCsExtend Users: 100 unitsRJ-45 10/100Mb internet interfaceSupports Windows 7/Vista/LinuxInterfaces: SPK plus MIC plus 3U*USB plus LAN plus VGACan connect to 3 USB devicesSupports 24-bit colorResolution: 1440 * 900, 1280 * 800Weight: 170gDimension: 118*118*25 mmPackage includes:1 * NC600 network terminal1 * Driver CD1 * English manual2 * Screws1 * AC 100-240V power adapter (2-flat-pin plug)1 * Back clip |
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TRENDNET 1 x ADSL Network WAN, 1 x 10/100Base-TX Network LAN, 1 USB LAN TDMC500 $37.28 TRENDNET 1 x ADSL Network WAN, 1 x 10/100Base-TX Network LAN, 1 USB LAN TDMC500 |
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CET Domain 10301701 USB 2.0 Network Card Adapter for Nintendo Wii Internet LAN $31.98 Ethernet Network AdapterLAN for Nintendo Wii. USB 2.0. Connects Your Wii Console To The Broadband Connection. Instantly creates an broadbank Ethernet connection from the USB port Need to have a broadband service form your Cable or Phone comanies. Plug and Play. CONTENT. 1 x Ethernet Network Adapter for Wii. This item takes between 721 days to ship/arrive because it ships out of Hong Kong or China. |
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2M Retractable Ethernet Lan RJ-45 Network Cable $4.55 Free shipping 2M Retractable Ethernet Lan RJ-45 Network Cable |
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LAN Tool Kit - Network tools kit $488.99 Black Box LAN Tool Kit - Network tools kit |
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LAN Tool Kit 100 - Network tools kit $416.99 Black Box LAN Tool Kit 100 - Network tools kit |
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Tl-R460 - Tp-Link Tl-R460 4-Port Cable/Dsl Router - 5 Port - 1 X 10/100Base-Tx Network Wan, 4 X 10/100Base-Tx Network Lan $35.37 tl-r460 Dsl Broadband Router is Designed For Small Office / Home Office (soho) Network Solutions. With Build-in Nat, Dhcp Server, Firewall And 4 Lan Ports, The Tl-r460 Router Will Allow You to Connect Your Network Better Than Ever, Sharing Internet Access, Fles And Fun, Easily And Securely. Tl-r460 is a Scalable Solution That Allows Users to Add Switches as Business Grows And Network Needs Expand. [KA4904] UPC: 845973040031 UNSPC: 43222609 10.36L x 7.21W x 2.88H 1.8 LB |
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USB Network LAN Card $7.19 Highlights:Allows you to access Local Area Network via USB portPlug and PlayNo external power is requiredTransfer speed 480MbpsBroad band Ethernet 10-100MbpsSupport USB 1.1/2.0 Specification:Connector type: USB, RJ45Data rates: Up to 480MbpsCompatibility: Windows 98SE/ME/2000/XP/Vista/7/MAC OS X/LinuxDimensions: 2.64in 0.79in 0.71inWeight: 0.54ozPackage Contents:1 x USB Network LAN Card 1 x Software CD |
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free shipping 1.5M Retractable Ethernet LAN RJ45 Network Cable #9862 $8.67 1.5M Retractable Ethernet LAN RJ45 Network Cable |
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RJ45 Network Lan Splitter Extender Connector Plug #9680 free shipping $18 RJ45 Network Lan Splitter Extender Connector Plug |
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LAN Adapter For Nintendo Wii $19.99 Creates a wired high-speed internet connection to the Wiimote™ The adapter is plugged in the Wii™'s USB port then the adapter is connected to the home network using the included 5' Ethernet cable |
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Netgear 3 x 10/100/1000Base-T Network LAN, 1 x 10/100/1000Base-T Network WAN, 1 x 10/100/1000Base-T Network LAN/DMZ UTM5100NAS $264.9 Netgear 3 x 10/100/1000Base-T Network LAN, 1 x 10/100/1000Base-T Network WAN, 1 x 10/100/1000Base-T Network LAN/DMZ UTM5100NAS |
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Cisco 4 x 10/100/1000Base-T Network LAN, 1 x 10/100/1000Base-T Network WAN, 1 x 10/100/1000Base-T Network WAN, LAN & DMZ SA520W $763.82 Cisco 4 x 10/100/1000Base-T Network LAN, 1 x 10/100/1000Base-T Network WAN, 1 x 10/100/1000Base-T Network WAN, LAN & DMZ SA520W |
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Netgear 1 x 10/100/1000Base-T Network WAN, 1 x 10/100/1000Base-T Network LAN/DMZ, 3 x 10/100/1000Base-T Network LAN UTM5EW100NA $271.45 Netgear 1 x 10/100/1000Base-T Network WAN, 1 x 10/100/1000Base-T Network LAN/DMZ, 3 x 10/100/1000Base-T Network LAN UTM5EW100NA |