Understanding Windows Firewall

Windows Firewall in Windows Vista is a significant advance over the Windows Firewall first introduced in Windows XP Service Pack 2. Table 27-1 illustrates a feature comparison between these two firewalls.

Table 27-1. Feature Comparison Between Windows Firewall in Windows Vista and Windows XP SP2

Feature

XP SP2

Windows Vista

Filtering direction

Inbound only

Both inbound and outbound

Default filtering action

Block (fixed)

Configurable actions for inbound and outbound traffic

Protocols supported

TCP, UDP, ICMP (partial)

Any IANA IP protocols

Types of rules

Filter by port, application, or ICMP type

Filter by any combination or permutation of the following: protocol, local or remote port (TCP and UDP only), ICMPv4/v6 Type and code, local ...

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