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CS-2000 UTM Content Security Gateway User's Manual
5.2 Service
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The TCP Protocol and UDP Protocol can provide different services and every service has its TCP port or UDP
port number. For example , TELNET(23) , FTP(21), SMTP(25) , POP3(110) , and so on . The Service function
includes two parts: Pre-defined and Custom.
The Pre-defined included the common used and pre-identified TCP service or UDP service .This kind of
service can not be modified and canceled. On the other hand, the user can set the proper TCP and UDP port
number in Custom Service function. When sets the Custom Service function, the Client port number range is
1024 to 65535; the server port is 0 to 65535.
In this chapter, we will introduce the three common use services, for example, Pre-defined, Custom and
Group. The MIS engineer can define the Protocol and port number in every network applied communication
by the following steps. The client port can transfer the data by using different server.
How to use the Service ?
In Service
Group, the MIS engineer can add the new group name. In the Group function, the MIS engineer
can simply many process when setting the policy. For example, there are 10 different IP address to access 5
different services via the server, for example, such as the HTTP, FTP, SMTP, POP3 and TELNET. If the MIS
engineers do not use the Group function, he has to set 50 policies (10x5=50). Actually the MIS engineer only
need to apply these services to the service group with one policy.
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