
because the ISP has to accommodate many different security policies.
Therefore, personal firewalls have been developed to provide
protection for remote systems and to perform many of the same func-
tions as larger firewalls. These products are typically implemented in
one of two configurations. The first configuration is a personal firewall,
which is installed on the system it is meant to protect; personal firewalls
usually do not offer protection to other systems or resources.
Likewise, personal firewalls do not typically provide controls over
network traffic that is traversing a computer network; they protect
only the computer system on which they ...