An Internet Connection Firewall Computer Science Essay

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When a computer is connected to the internet, outside world, there is the risk of unauthorized attempts to access the computer and data. A firewall can keep user home network against the threat of insecure network traffic, while allowing appropriate network traffic to move and to protect such a manner. This software-based firewall is activated automatically whenever the Network Setup Wizard is run, the creation of user with the default firewall settings that will work for most networks. It can also be enabled or disabled manually through network connections folder. 

Internet Connection Sharing (ICS) 

Windows 2000 included ICS to share an internet connection between all computers on a home or small office network. The computer connected to the internet would have enabled ICS and give attention, and network address translation services for all of the computers on the network. Besides providing a DHCP allocator for automatic address and a DNS proxy for the name decided, the Windows XP ICS service is also better to leverage Universal Plug and Play (UPnP) in Windows XP. 

The customer can then use UPnP to different actions performed by ICS. These actions include the ability to connect or disconnect ICS, to list network address translation port mappings, or to make sure the port mappings to be changed. It enables customers to the internal network to accept incoming connections. 

Network Bridging Support By building a network in a home or small office users can find that a particular network medium works well in one area of the network, but not in another. For example, a few computers near phone jacks so they are established to be connected with Home PNA network devices. Other computer can be anywhere near a phone jack, requires selection of a different network medium such as wireless. Windows XP, such as Ethernet, telephone line, wireless IEEE 1394, supports many media types. 

Traditionally, these networks were connected together to configure an IP sub-networks and routers needed to connect the different mediums together. The Network Bridge allows a Windows XP system to act as a bridge for these multiples network mediums. When more than one network connections are added to a Windows XP system and the Network Setup Wizard, which is used for configuring the system, the network will automatically bridge the networks for the user bridge. 

This leads to a network configuration consisting of a single, easily configured network segment includes all network mediums. The Windows XP Network Bridge will forward packets to the appropriate segments based on the device address and maintain information about which system is on what physical medium. 

Network Diagnostics Features 

Network diagnostics functions were to assist the diagnose network problems. With an increasing number of people setting up small networks, to enable these functions to solve problems that can solve complex problems with almost every level is used. 

The Network Diagnostics Web page and NetSh assistant web page can be instantiated in several places, including the Network Connections folder, the Tools section of help and support, or the help and support of detailed information about parts or troubleshooting of the network. This web site makes it easy to share important information on the local computer to retrieve and the network is connected to. The site also contains various tests for troubleshooting network problems. Furthermore, an assistant NetSh DLL is meant to implement the more extensive tests than the website, but from a command line. This helper is accessed from the 'diag' context NetSh 

Network Connections Support Tab-The status page for each network connection in the Network Connections folder now also includes a support tab. From this tab, information and tasks that previously provided by the Windows IP Configuration tool, Winipcfg.exe, is provided. Part of this includes the reset option is used to try and network users to reset to a working state. 

Repair Connection Link-When the computer to configure the network was in a state that prohibits communication network, but can through a series of general repair procedures, as only the IP address and DNS name registrations. To avoid having to take these steps by hand, has a Repair link added to the network connection in the context menu. This option causes a series of steps must be taken that it was very likely that communication problems, but is not known to cause serious problems. 

Task Manager Network Tab - Task Manager can be real time statistics for each network adapter in the system shows. It will also provide a quick look at how the network is performing 

Updated Command Network Diagnostic Tool - Part of the support tools that come with the Windows XP installation CD, netdiag.exe is a command line tool diagnoses strengthens the version in the Windows 2000 resource kit. 

Linux Features 

As Linux has developed on the internet, it has many possibilities of network characteristics such as: 

Network servers, eg. Samba server, print server, file server, Mail server, FTP server, web server, News server, DNS server, database server and / Boot server. 

Linux can access and control panel with workstation rdesktop and tsclient tool. 

Linux can access the exchange of files in a window with workstation smbclient tool. 

• File Sharing With Windows workstation Samba 

• Dial-up connections 

• Security And The Internet 

• File Sharing with NFS 

• File Sharing With Netware 

• Easily manage NIC to the network management tool 

Interoperability features of Ubuntu with the shutdown of Microsoft Window Workstations. 

Samba is a tool that can be performed as 

Part of a folder 

1. On the Windows server, browsing in the explorer (the "My Computer") to the location of the folder you want to share (C: \ Documents and Settings for example). Next right click on the folder to share and select Sharing and Security ...". In the pop-up window, click the "Sharing" tab. Click the "Network Setup Wizard" to configure your network to allow shares. Work your way through the wizard. Note the default workgroup is MSHOME. You can change this value if you wish, but all of your computers must be in the same workgroup. Eventually, you will be given the option to "Turn on file and printer sharing." This is the option you want, continue with the network wizard. You will have your computer for the settings to restart to take effect -> Start Windows. 

2. After rebooting, re-open explorer (the "My Computer") and to the folder you want to share. Again right click the file and select "Sharing and Security ...". In the pop-up window, click the "Sharing" tab. In the "Network sharing and security" box, tic (select with the mouse) the "Share this folder on the network" checkbox. Give the file a Nomenclature section. This will give read only access to computers via the Ubuntu samba. Then to read / write access tic (select with the mouse) the "network users to change" my files check box. Click the "Apply" button and close the dialog.

Overview on VPN Software

VPN connects two endpoints over a public network to form a logical connection. The logical connections can be either Layer 2 or Layer 3 of the OSI model is made, and VPN technologies can broadly be classified in this logical connection models as Layer 2 VPNs and Layer 3 VPNs.

Conceptually, establishing connections between places on a Layer 2 or Layer 3 VPN is the same. The concept involves the addition of a "head-rendering" in front of the payload to get to the destination site. In the case of Layer 2 VPNs, the delivery head is at Layer 2, and in the case of Layer 3 VPNs, it is natural to Layer 3. ATM and Frame Relay are examples of Layer 2 VPNs, GRE, L2TP, MPLS, and IPSec are examples of Layer 3 VPN technology

Managed VPNs are a much more robust offering of a service provider. The exact benefits and components of this service will vary from carrier to bear, but it is typically the supplier of the management of everything from the router using the connection to the public network entails. Detailed usage reporting and monitoring is typically delivered on a regular basis and available for analysis applied to the VPN service to the customer the maximum benefit. The remainder of this section will define the physical architecture and components of managed VPN service, and detail how these services are priced.

Un-Managed VPNs refers to a simple local connection to a public network, combined with a kind of VPN access device. These VPN devices can access a piece of hardware or software is located on the client's end of the internet. There are a number of VPN hardware and software products available on the market, each for its own unique type of solution. Un-Managed VPNs falls entirely on the client to design, implement and manage: The Internet Service Provider (ISP) or carrier treats the data sent as standard IP-only traffic to the Internet.