Proxy provides users access internet with the host application. The proxy server to serve the special rites or a collection of rites performed on dual_homed host or braison host. The client program of user through proxy server will intermediate and replace the actual server that the user needs to communicate. Proxy server identifying client requirements and decided to respond or not respond, if the request is met, the proxy server will connect to the server instead of the client, and it continues to transition to the request from the client to the server , as well as meet the requirements of the server to the client. So the proxy same as connection bridge between server and client.
The proxy allow the user to access internet services on the direct sense. With dual homed host needs to login to the host before using any services on the internet. This is often inconvenient, and some young people frustrated when they feel through firewalls, proxies it to solve this problem. Of course it also has the new protocol, but in general it is quite convenient for the user. Because proxy that allows users to access services on the internet from their personal system, so it does not allow packets directly between systems and internet use. indirect way is through dual homed host or through a combination of screening and rounter bastion host.
One proxy server, same as firewall, is designed to protection of natural resources in the local network when linking other networks such as network Internet. We do also difficult to distinguish the differences between proxy server and firewall. You can think that proxy is services run on firewall, where which firewall is a server physicists located between Internet and local network. Basic, firewall provides control expand to filter and supervision information out into network. For example, firewall can execute services packet filtering data in storey network (network layer) to close package data which have source address separate or spend for a services somehow. Proxy services run on firewall at the application level provide a system transmission control load sophisticated.
The proxy services is a way to prevent internet users trying to access the local network. These services are designed to use local network services. Only the data package is required by local network users are transmitted through the firewall.
For example, suppose a workstation's local network want to access a Web server on the internet. HTTP proxy service running on the firewall blocks HTTP packets of users, repackaging and transfer of data required to put the Web server on the internet. The packet contains the source IP address of the proxy server, not the IP address of the user's workstation. Apparently, they same as all data packets are transmitted from the proxy server, which provides a level of security and confidentiality for all address inside. When a Web server answers the request, the proxy server receives the answer and move this to the local workstation. The advantage of this method is the local network is not adapted to the internet's addressing standards, an important factor when the internet running based on IP address. For safety reasons, the packet will be tested to the virus or the ability to change data by vandals outside. Proxy servers can create a Web server encryption prevents destruction of useful resources.
Proxy servers also have important buffer functions. Because it is a central location for local network users can access the internet, a proxy server can store the documents are accessed frequently on the Internet and allows users to access their local network when needed. For example, thousands of users can access the content Dilbert every day. If a company has a proxy server host, this will be the first store in the day. The user then accesses this item from a local store and not from the Dilbert website. Because the proxy server control packets to local network users, it is also easy to check virus, data filtering and access control. The package contains desired data can be removed. The proxy server provides services for applications such as HTTP, FTP, Telnet, and other internet protocols. There are many proxy compatibility for various applications. In special cases, the workstation must be running special software to access the firewall. For example, Microsoft's proxy allow computer running on IPX protocol(Internetowrk Packet Exchange). Access the proxy server must be used special software. In addition, the proxy server can use SOCKS, an authentication protocol that requires workstations to have the software to access the SOCKS.
Summarized, the proxy server is an intermediary device allowing users to access the website indirectly. The website is not placed on this proxy. This is very common and necessary as we need access to the international web site, some web sites are blocked ... can only be accessed using a proxy. But when we use proxy that will be difficult in some cases we do not have access to some of the web, this is because the website does not support proxies
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