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MH-2001 Multi-Homing Security Gateway User's Manual
6.2 Service
In this section, 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.
What is 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), POP3(110),etc. MH-2001 defines 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.
How do I 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.
6.2.1 Pre-defined
Entering a Pre-defined window
Step 1. Click Pre-defined under it. A window will appear with a list of services and their associated IP
addresses. This list cannot be modified.
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