Chapter 4 Types Of Services; Packet Filter Services; Any - Watchguard Firebox X1000 Reference Manual

Types of Services
CHAPTER 4
This chapter describes well-known services, their protocols, and their
ports as well as special considerations for adding the service to a security
policy configuration. Rather than explain every service in detail, this
chapter explains the telnet service thoroughly as an example from which
to extrapolate configuration details for similar services. Services fall into
two broad categories–packet filters and proxies.

Packet Filter Services

Packet filter services examine the source and destination headers of each
packet. Packets are then either allowed or denied passage based on
whether the headers appear to be coming from and going to legitimate
addresses.

Any

The Any service should be used only to allow ALL traffic between any
two specific, trusted IP or network addresses. Configuring the Any
service opens a "hole" through the Firebox, allowing all traffic to flow
unfiltered between specific hosts. WatchGuard strongly recommends that
the Any service be used only for traffic over a VPN.
Reference Guide 39