Netopia R2020 用户手册

You may wish to restrict access to the web-based screens to prevent inadver tent switching or connecting and 
disconnecting of Connection Profiles. Since Smar tStar t can be used to reconfigure the router, you may wish to 
block inadver tent damage resulting from unauthorized use of Smar tStar t. To prevent access to these features 
toggle this option to “No”.

Telnet is a TCP/IP ser vice that allows remote terminals to access hosts on an IP network. The Netopia R2020 
suppor ts Telnet access to its configuration screens. 

Caution!

You should consider password-protecting or restricting Telnet access to the Netopia R2020 if you suspect there 
is a chance of tampering.

To password-protect the configuration screens, select Easy Setup from the Main Menu, and go to the Easy 
Setup Security Configuration screen. By entering a Name and Password pair in this screen, all access via 
serial, Telnet, SNMP, and web ser ver will be password-protected.

To restrict Telnet access, select Security in the Advanced Configuration Menu and go to the Security Options 
screen. There are two levels of Telnet restriction available:

To restrict Telnet access to the SNMP screens, select Enable Telnet Access to SNMP Screens and toggle it to 
No. (See 

)

To restrict Telnet access to all of the configuration screens, select Enable Telnet Console Access and toggle it 
to No.

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 R2020’s packet filters are designed to provide security for the Internet connections made to and 
from your network. You can customize the router’s filter sets for a variety of packet filtering applications. 
Typically, you use filters to selectively admit or refuse TCP/IP connections from cer tain remote networks and 
specific hosts. You will also use filters to screen par ticular 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 power ful 
security tools work.

A filter is a rule that lets you specify what sor t of data can flow in and out of your network. A par ticular filter can 
either be 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.