A Firewall Can Use Packet Filter Computer Science Essay

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A firewall can use packet filter. As information is sent from one computer to the next the information is not sent all at one time it is sent in packets or sections of the entire message along the Internet. If you are using a packet filtering firewall, it will examine each packet as it passes through the firewall and compares it to the filter to see if that packet is allowed to continue or not. A packet filtering firewall is helpless to spoofing. Spoofing is when someone like a hacker finds a way to hide his true Internet Protocol (IP) address so that he or she can get through your filter. If you are sending someone a message the hacker could catch your message and then retransmit your message either take the information out of the message or copy the message and then forward the message on to the intended recipient. Either way you look at it once the hacker gets the information he can make his message seem to come from you or a trusted IP address that the filter will allow into your network.

Packet filter is a network security machine that works by controlling what data flow to and from a network. It is to transfer the information across a network, the information has to be broken up into small pieces, each piece will be sent individually. With the breaking the information into pieces, it allows many systems to share the network, each sending pieces in turn. In the IP networking, those small pieces of data are called packets. All the data transfer across IP networks happens in the form of packets.

The basic device that interconnects IP networks is called a router. A router may be a dedicated piece of hardware that has no other purpose, or it may be a piece of software that runs on general use UNIX or PC (Windows, Macintosh, or other) system.

The Packet filter lets you to control allows or disallows data transfer based on the: -

Where is the address data is coming from

Where is the address data will going to

The session and application protocols has being used to transfer the data or information

Most of the packet filter system doesn't do anything based on the data itself. The packet filters don't make connect-based decision.

Packet filter is a network security machine that works by controlling what data flow to and from a network. It is to transfer the information across a network, the information has to be broken up into small pieces, each piece will be sent individually. With the breaking the information into pieces, it allows many systems to share the network, each sending pieces in turn. In the IP networking, those small pieces of data are called packets. All the data transfer across IP networks happens in the form of packets.

The basic device that interconnects IP networks is called a router. A router may be a dedicated piece of hardware that has no other purpose, or it may be a piece of software that runs on general use UNIX or PC (Windows, Macintosh, or other) system.

The Packet filter lets you to control the allows or disallows data transfer based on the: -

Where is the address data is coming from

Where is the address data will going to

The session and application protocols has being used to transfer the data or information

Most of the packet filter system doesn't do anything based on the data itself. The packet filters don't make connect-based decision.

Advantages of Packet Filter

One transmission router can help to protect a whole network.

Packet filtering is "free". If you already have a router, it most likely supports packet filtering. On a small LAN a single router can be sufficient for use as a packet filter. One of the important key advantages of the packet filters is that a single, well placed the packet filters router can help protect a whole network.

Packet filters is generally available in many routers.

In theory, you only need one, at the point where your LAN connects to the internet or an external network. This provides a "choke point" for the network. Packet filters is available in many hardware and software route products, both business and freely available over the internet. Most sites already have packet filters available in the router they use.

Packet filters doesn't require user knowledge or cooperation.

You don't have to train users or use any special client or server programs to implement packet filters. The transmission of the router or packet filters host transparently does all the work to the client in your network. Unlike proxy, packet filters doesn't require any custom software or configuration of client equipment, not does it require any special training or procedures for users. When a packet filters router decides to let a packet through, the router is similar from a normal router. If possible, the users won't even realize it's there, unless they try to do something that is illegal (because it is a security problem that contains the outsider) by the packet filters router's filtering policy.

Disadvantages of Packet Filter

Routers can be difficult to configure, especially if you using a complex configuration with a large number of rules. In this situation they can also be difficult to test carefully.

When a packet filter fails, or is not configured correctly, the damage that might be done to your network could be much worse than when a proxy server fails. Even though a router might allow forwarding of IP packets due to a bug or a miss configured rule set, when a proxy application breaks, there is no direct forwarding of IP packets. The breakdown of the proxy server the connection.

Packet filters work on a small set of data - the header information in the IP packet. Because this is all the information that can be used to decide whether a packet should be allowed to pass through the firewall, a packet filter is limited in the decisions it can make. Advanced check up techniques improves on this, but you still consider using proxy server (in addition to a packet filter) for a complete firewall solution.

Many packet-filtering routers lack robust logging capabilities, so it is difficult to get of a lot of helpful information when a system has infiltrated or attacked.

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