By Cameron R., Cantrell C., Hemni A.
Configuring Juniper Networks NetScreen & SSG Firewalls is the one whole connection with this kinfolk of goods. It covers all the newly published positive aspects of the product line as highlighted via Juniper Networks, together with: whole insurance of built-in Intrusion Prevention step by step directions for shielding opposed to Worms, Trojans, spy ware, and Malware complicated info on Virtualization applied sciences And assurance of significant new updates: Deep inspection firewall, Centralized- policy-based administration, integrated excessive availability gains, & swift deployment good points.
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Extra info for Configuring Juniper Networks Netscreen & SSG Firewalls
Stateful inspection functions like a packet filter by allowing or denying connections based upon the same types of filtering. However, a stateful firewall also monitors the “state” of a communication. So, for example, when you connect to a Web server and that Web server must respond to you, the stateful firewall has the proper access open and ready for the responding connection. When the connection ends, that opening is closed. The major vendors recognize this and have to make their own decisions about what exactly constitutes a UDP or ICMP connection.
Packet filters in modern routers are also very high performance. This is extremely important when the routers are used at the Internet edge, either at the carrier side or the customer side of the Internet link. This is commonly done to offload the impact of these inbound sessions on the perimeter firewalls next in line. An example of such a case would be a SYN flood from the Internet inbound to a Web server protected behind a perimeter firewall in the DMZ. qxd 28 11/7/06 2:04 PM Page 28 Chapter 1 • Networking, Security, and the Firewall of-service (DOS) attacks from the Internet hit your perimeter firewall and overload its ability to “fend off ” the attack, compromising the other sessions/flows traversing the firewall.
You can be attacked from another continent thousands of miles away just as easily as from your own town. Threats can be classified as structured or unstructured. These usually come from people called script kiddies—attackers who have little to no programming skill and very little system knowledge. They obtain attack tools that have been built by others with more skill and use them, often indiscriminately, to attempt to exploit vulnerabilities in their target. If their attack fails, they will likely go elsewhere and keep trying.
Configuring Juniper Networks Netscreen & SSG Firewalls by Cameron R., Cantrell C., Hemni A.