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138 USING THE M208’S ADDITIONAL OPTIONS: TCP/IP Options
• using npconfig’s Detailed Configuration Options Sub-Menu,
• using the FTP Daemon,
• through an SNMP manager.
Maintaining Network Security
Besides the general security measures mentioned in Network Security on page 131,
the M208 provides two more for TCP/IP environments. These include:
• a TCP access list,
• scrambling/descrambling of print jobs.
Access List
The TCP access list is protects the M208 and its configuration while the scrambling
protects your print data from being viewed by others as it passes over the network to
the M208.
The M208 has the ability to control host access to printer destinations and remote
command execution services. This is done using an access list, similar in function to
the UNIX .rhosts file. If the access list is empty, any host can have access to the
M208’s services. If there are entries in the access list, only those hosts specified have
access to these services. Although the maximum number of entries is 10, each entry
can refer to a network or a host so more than 10 machines can be enabled.
Only users that have root permission can configure the remote host access entries.
Users with guest permission can only display these entries.
To set up the access list, please see store tcpip on page 122 and to look at the current
settings, see list tcpip on page 101.
Scrambling/Descrambling
A second method of security is provided through data scrambling/descrambling.
This TCP/IP security method protects users’ print data as it is sent across the network
to the M208 for printing. A binary is provided on the host, npscramble, which scram-
bles the print job. Then when it reaches the Print Server, the job is descrambled for
printing.
This scrambling method will protect against casual viewing with network analyzers.
However, it is not encrypted and cannot be considered safe from cryptographic attack.
Note
Note