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8-64 User’s Reference Guide
To restrict Telnet access to all of the configuration screens, select Enable Telnet Console Access and toggle it
to No.
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Important Note: The Netopia D-Series’s filter sets only work when the unit is in bridge mode. They have no
effect when the unit is in DSU mode.
Security should be a high priority for anyone administering a network connected to the Internet. Using packet
filters to control network communications can greatly improve your network’s security.
The Netopia D-Series’s packet filters are designed to provide security for the Internet connections made to and
from your network. You can customize the Netopia D-Series’s filter sets for a variety of packet filtering
applications. Typically, you use filters to selectively admit or refuse TCP/IP connections from certain remote
networks and specific hosts. You will also use filters to screen particular types of connections. This is
commonly called firewalling your network.
Before creating filter sets, you should read the next few sections to learn more about how these powerful
security tools work.
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A filter is a rule that lets you specify what sort of data can flow in and out of your network. A particular filter can
be either an input filter—one that is used on data (packets) coming in to your network from the Internet—or an
output filter—one that is used on data (packets) going out from your network to the Internet.
A filter set is a group of filters that work together to check incoming or outgoing data. A filter set can consist of
a combination of input and output filters.
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A filter set acts like a team of customs inspectors. Each filter is an inspector through which incoming and
outgoing packages must pass. The inspectors work as a team, but each inspects every package individually.
Each inspector has a specific task. One inspector’s task may be to examine the destination address of all
outgoing packages. That inspector looks for a certain destination—which could be as specific as a street
address or as broad as an entire country—and checks each package’s destination address to see if it matches
that destination.
A filter inspects data packets like a customs inspector scrutinizing packages.
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