Configuring Netscreen Firewalls

Configuring Netscreen Firewalls, 9781932266399 (1932266399), Syngress Publishing, 2004

Every enterprise requires at least one firewall to provide the backbone for its network
security architecture. Firewalls are the core component of your network’s
security.The risks today have greatly increased, so the call for a stronger breed of
firewall has been made. In the past, simple packet filtering firewalls allowing
access to your internal resources have helped to mitigate your network’s risk.The
next development was stateful inspection allowing you to monitor network sessions
instead of single packets.Today’s risks are far greater and require a new generation
of devices to help secure our networks’ borders from the more
sophisticated attacks.

Firewalls police your network traffic. A firewall is a specialized device that
allows or denies traffic based upon administratively defined policies.They contain
technologies to inspect your network’s traffic.This technology is not something
that is exclusive to firewalls, but firewalls are designed specifically for inspecting
traffic and therefore do it better then any other type of device.Any network can
have millions of packets transverse it in a short period of time. It is impossible for
a human to directly interact with the network. Even if you were to use a tool to
look at the traffic directly it would be impossible for you to decide which traffic
is good and which is bad.The need for a specialized device to enforce traffic
restrictions has grown over the years. Because security is of such high importance,
a specialized device was required to ensure the security of network traffic.

NetScreen firewall appliances have answered this call for a secure enterprise.
The NetScreen firewall product line has complete offerings from the home
office to the carrier-class networks. In this chapter we will review networking
basics. Security requires a strong basic knowledge of networking protocols. In our
first section,“Understanding Networking,” we will look at networking from a
top-down approach.This section starts with the basic ideas of networking models
and then works into full networking communications.We will also discuss the
components and prerequisites of IP addresses and how they are divided up to
make networks.

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