Chapter 6 NAT Configuration
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The Internet makes two transport protocols available to its applications, namely TCP
and UDP.
Transmission Control Protocol
(TCP)
For building a reliable communications stream
on top of the unreliable packet Internet Protocol
(IP). TCP is the protocol that supports nearly all
Internet applications.
User Diagram Protocol (UDP)
A connectionless protocol that runs on top of IP
networks. UDP/IP provides very few error
recovery services, offering instead a direct way
to send and receive datagrams over an IP
network. It is used primarily for broadcasting
messages over a network.
6.3 Filtering Setting
Compex CGX3224 allows Packet Filtering rules be defined based on three factors,
Source IP Address, TCP Port and Time. IP Packet Filtering examines the outgoing
packets and decides whether to bypass or to block them. After the Packet Filtering rules
have been defined, the users may select to bypass or to block the outgoing packets that
do not match the rules.
For example, assume that a rule has been defined as "TCP Port 23 (used by TELNET)
from any IP on any day at any time". If the “forwarded” radio button is selected, all
outgoing packets will be sent except TELNET session. If the blocked radio button is
selected, all outgoing packets will be blocked except TELNET sessions.
Click on Filtering Setting at the Configuration window and the GUI will appear as
shown:
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