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Network Management Card User’s Guide 55
Network Management Card
Security
Introduction
Overview
The Management Card provides several different security options,
depending on the access interface used. Each of these individual
elements is described below, and a summary table is given for each
interface. In general, the security aspects of the Management Card
should provide a reasonable level of access and authentication control.
As a network device that passes information across the network,
though, it is subject to the same exposure as other devices on the
network. Protecting intranet networks that are connected to external
networks (the Internet) with devices such as firewalls, is also an
extremely important element in security.
Port assignments
It is possible to define the
TCP
ports that the Telnet,
FTP
and Web
servers utilize. These are initially set at the standard “well known port”
for the particular protocol. To enable users to hide the interfaces, one
can use arbitrary ports from 5000-65535. Once an interface uses a non-
standard port, it is required to specify the port when using a client
interface, such as a Web browser. Hiding the servers provides a level of
security in obscurity. In a sense, the non-standard ports are extra
passwords. For examples of what the commands would look like when
the default port numbers are changed, see FTP Server, Telnet and
Web on page 20.
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