HP SuperStack Firewall Series Uživatelský manuál stáhnout pdf (Strana 184)

184 C

HAPTER

14: N

ETWORKING

ONCEPTS

Port Numbers The port numbers are divided into three ranges:

■

Well Known ports — those from 0 to 1023

■

Registered ports — those from 1024 to 49151

■

Dynamic or Private ports — those from 49152 to 65535

Well Known Port

Numbers

The Well Known Ports are controlled and assigned by the Internet

Assigned Numbers Authority (IANA)

http://www.iana.org

and on most

systems can only be used by system processes, or by programs executed

by privileged users. Many popular services, such as Web, FTP, SMTP/POP3

e-mail, DNS and so forth operate in this range.

The assigned ports use a small portion of the possible port numbers. For

many years the assigned ports were in the range 0–255. Recently, the

range for the assigned ports managed by the IANA has been expanded to

the range 0–1023.

Registered Port

Numbers

The Registered Ports are not controlled by the IANA and on most systems

can be used by ordinary user processes or programs executed by ordinary

users.

While the IANA cannot control uses of these ports, it does list uses of

these ports as convenience.

The Registered Ports are in the range 1024–49151.

Visit

http://www.ietf.org/rfc/rfc1700.txt

foralistofIPport

numbers.

Private Port Numbers The Private Ports are not controlled or recorded by the IANA and are used

in the development of new software and in bespoke programs which will

be used by few users only.

The Private Ports are in the range 49152–65535.

Virtual Private

Network Services

This section contains the following:

■

Introduction to Virtual Private Networks

■

VPN Applications

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