User Guide
59
Packet Filter Policies
WHOIS
The WHOIS protocol gives information about the administrator of web sites and networks. It is
frequently used to find the administrator of a different web site.
To filter WHOIS traffic, add a WHOIS policy that allows connections to the WHOIS server (such as
rs.internic.net).
Characteristics
•
Internet Protocol(s): TCP
•
Port Number(s): 43
X11
The X Windows System Protocol has components that are used to create graphic desktops, which
include windows, colors, displays, and screens. X11 also supplies a flow of events that show the
interaction between a user and a computer input device (such as a mouse, keyboard, and so on).
Characteristics
•
Internet Protocol(s): TCP
•
Port Number(s): 6000-6063