CHAPTER 5: Advanced Setup Menu
75
Example 3:
The company management wants to allow only the PC with the IP address 1.2.3.4 access to the Internet. In
addition, the connection to the Internet is to be terminated if 3 frames every 60 seconds are not transmitted
from Using the Specific Frame to Forward option ensures that only the specified PC has access this PC.
Therefore the following must be defined:
• Start Connection must be Specific Frame to Forward. A filter which allows only frames from the 1.2.3.4 IP
address must be defined.
• Terminate Connection must be No Specific Frame to Forward. A filter which counts only frames from the
1.2.3.4 IP address must be defined. In addition, the rate must be defined at 3 frames/60 seconds.
Figure 5-39. Limiting Access to a specific PC.
Example 4:
A company uses a phone line which uses a phone and modem to connect to the Internet. The only time that
the employees may connect to the Internet is if they need to upload files to or download files from a FTP site.
Any connection to the Internet is to be done manually. After the file has been uploaded or downloaded, the
connection is to be terminated automatically. Therefore the following must be defined:
• Start Connection must be Never. Any time someone wants to connect, the user must connect manually.
• Terminate Connection must be Upon Time Out. The time is set to 30 seconds.
• Set filter to FTP Only Forwarded.
Connection is terminated
if 3 frames from PC
1.2.3.4 are not forwarded
in 60 seconds
Internet
P.T.T.
Modem
PC 1.2.3.7 is blocked
from the Internet
Ethernet Extender
PC 1.2.3.6 is blocked
from the Internet
PC 1.2.3.5 is blocked
from the Internet
PC 1.2.3.4 is able to
connect to Internet
1.2.3.7
1.2.3.6
1.2.3.5
1.2.3.4
Summary of Contents for LB3104A series
Page 3: ......
