Internet Security Systems

Basic Internet security can be provided at the routers level using Access control Lists (ACLs) and Network Address Translation (NAT). More advance Internet security system use techniques like packet filtering which can be described as the inspection of data packets based on header information like source and destination addresses, ports, protocol type and even message contents. Other advanced security systems perform stateful inspections, this method consists in packet inspections based on sessions and tracking of individual connections. Packets are allowed to pass only if associated with a valid session initiated from within the network. The more advanced systems are called Application Level Gateways which protect specific network services by restricting the features and commands that can be accessed from outside the network.

Internet security mechanism can be embedded withing the network switching/routing equipments or in dedicated equipments such firewall and security appliances. Firewalls make only packet and session inspection and security appliances integrate all security methodologies.

Intrusion Detection Systems (IDS) deal with Internet security by preparing for and dealing with attacks by collecting information from a variety of system and network sources, then analyzing the symptoms of security problems. IDSs serve three essential security functions; monitor, detect and respond to unauthorized activity. IDS can also response automatically to security breach events bu logging off a user, disabling a user account or even act upon network equipments to mitigate the intrusion at the lowest network level. The benefits of IDS are the ability to monitor the operation of firewalls, routers, key management servers and files critical to other security mechanisms. Also, allow the administrator to tune, organize and comprehend often incomprehensible operating system audit trails and other logs. IDS can make the security management of systems by providing user friendly interfaces. An important feature of IDS is the ability to recognize and report alterations to data files.




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