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Chapter 4
Enhancing security
Enhancing security
Outline of unauthorized accesses and security measures
Internet
Intrusion
exploiting
security holes
What is unauthorized
access from the
Internet?
• While you are accessing the Internet, malicious
individuals may attack (gain unauthorized
access to) your PC or router to destroy the data
or use the line without permission. If a router
is installed between your PC and the Internet,
then NAT, IP masquerade, and other address
conversion functions of the router can provide
security to a certain degree. However, even in
such an environment, possible setting errors or
inadequate settings pose a similar risk.
• In addition to unauthorized accesses via the
Internet, you should also be aware of the risk of
attacks by computer viruses.
• Should the settings of the product be modified or
the PC system or data be destroyed, a massive
amount of data and monetary damages would
be resulted. You must configure filter settings of
the product or take other security measures to
protect your system.
exploiting security
Invalid
packets
Invalid
packets
LAN
PC
Computer
viruses
Intrusion
holes
UP LINK
1
2
3
4
Server
PC
A particular attention is required if a
router has a global IP address
Malicious individuals mainly use "global IP
addresses" to gain a foothold for attack. The longer
the same global IP address is used, the higher the
probability of unauthorized access to the LAN.
When you use a service with fixed IP addresses
or a network connection service, such as a CATV
or ADSL service with continuous use of a dynamic
address assigned upon connection with that
service, we recommend that you provide adequate
security for your configuration.
You should also give heed to the
password setting
Using the product without setting a password
will pose great security risks. Be sure to set the
password, and change it periodically.
FWX120 Operation Manual 73
PC
4
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