PLANET SG-500 - Manual (Page 65)

SG-500 VPN Security Gateway User’s Manual
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4.3 Service
TCP and UDP protocols support varieties of services, and each service consists of a TCP Port or
UDP port number, such as TELNET (23), SMTP (21), SMTP (25), POP3 (110), etc. The SG-500
includes two services: Pre-defined Service and Custom Service.
The common-use services like TCP and UDP are defined in the Pre-defined Service and cannot be
modified or removed. In the custom menu, users can define other TCP port and UDP port
numbers that are not in the pre-defined menu according to their needs. When defining custom
services, the client port ranges from 0 to 65535 and the server port ranges from 0 to 65535.
In this chapter, network services are defined and new network services can be added. There are
three sub menus under Service which are: Pre-defined, Custom, and Group. The Administrator
can simply follow the instructions below to define the protocols and port numbers for network
communication applications. Users then can connect to servers and other computers through these
available network services.
How to use Service?
The Administrator can add new service group names in the Group option under Service menu, and
assign desired services into that new group. Using service group the Administrator can simplify the
processes of setting up control policies. For example, there are 10 different computers that want to
access 5 different services on a server, such as HTTP, FTP, SMTP, POP3, and TELNET. Without the
help of service groups, the Administrator needs to set up 50 (10x5) control policies, but by applying
all 5 services to a single group name in the Service field, it takes only one control policy to achieve
the same effect as the 50 control policies.