The Development Of Firewalls And Its Significance In Safe-guarding Networks
Prior to firewall software were created, routers supplied network security via the use of Access Control Lists. Firewalls themselves only came on scene within the late 1980s in response to the demand for higher security as the Web began to take shape.
The Firewalls before were fairly simple packet filters that worked by inspecting the IP packets, and comparing certain information in the packet with a set of packet filtering rules. The Source and Destination IP Address, together with the protocol type would normally be checked against this set of rules. When TCP or UDP were the protocol type, then the port numbers would also be checked. This meant that application protocols using well known port numbers could be identified and filtered by means of the port numbers associated with them.
In case an application is utilizing non-standard port number then their identification wouldn't be feasible. Packet filters are therefore only really efficient at the lower layers of the OSI reference model as much as Layer 4, the transport layer. These packet filter fire walls are referred to as Stateless, since they aren't in a position to figure out exactly where a packet sits inside a stream of packets, or what the condition of the interconnection is at the time.
The following stage of the development of firewalls was that of stateful packet inspection exactly where every information packet is examined, also as its position within a information stream. A stateful packet inspection firewall can figure out whether or not an individual packet is part of an existing conversation or stream, or whether or not it's the start of a brand new connection. This kind of firewall was offered the label of second-generation because it was a step up from the usual stateless packet filter.
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The Firewalls before were fairly simple packet filters that worked by inspecting the IP packets, and comparing certain information in the packet with a set of packet filtering rules. The Source and Destination IP Address, together with the protocol type would normally be checked against this set of rules. When TCP or UDP were the protocol type, then the port numbers would also be checked. This meant that application protocols using well known port numbers could be identified and filtered by means of the port numbers associated with them.
In case an application is utilizing non-standard port number then their identification wouldn't be feasible. Packet filters are therefore only really efficient at the lower layers of the OSI reference model as much as Layer 4, the transport layer. These packet filter fire walls are referred to as Stateless, since they aren't in a position to figure out exactly where a packet sits inside a stream of packets, or what the condition of the interconnection is at the time.
The following stage of the development of firewalls was that of stateful packet inspection exactly where every information packet is examined, also as its position within a information stream. A stateful packet inspection firewall can figure out whether or not an individual packet is part of an existing conversation or stream, or whether or not it's the start of a brand new connection. This kind of firewall was offered the label of second-generation because it was a step up from the usual stateless packet filter.
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About the Author:
Macky Robinson is an Internet security analyst who likes to
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share his knowledge about Fast
anonymous proxies on his blog where he also writes about legitimate ways to make money online.
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