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Environmental Monitoring
Environmental Monitoring Unit: User’s Guide 25
Security
Security Features
Planning and
implementing
security features
As a network device that passes information across the network, the
Environmental Monitoring Unit is subject to the same exposure as
other devices on the network.
Use the information in this section to plan and implement the security
features appropriate for your environment.
Port assignments
If a Telnet,
FTP
, or Web server uses a non-standard port, a user must
specify the port when using the client interface, such as a Web
browser. The non-standard port address becomes an extra
“password,” hiding the server to provide an additional level of security.
The
TCP
ports for which the Telnet,
FTP
, and Web servers listen are
initially set at the standard “well known ports” for the protocols.To hide
the interfaces, use any port numbers from
5000 to 65535
.
For an example of how to access a client interface for which the port is
non-standard, see
Access to the Web interface on page 3.
User names,
passwords,
community names
All user names, passwords, and community names for
SNMP
are
transferred over the network as plain text. A user who is capable of
monitoring the network traffic can determine the user names and
passwords required to log into the Environmental Monitoring Unit’s
Control Console or Web interface as an Administrator or Device
Manager. This security limitation of the protocols affects any device
using Telnet, a Web server, or an
SNMP
version 1 agent.