93
Enhancing security
5
Addressing unauthorized
accesses
Unauthorized accesses to the Internet can be divided
into several types. The following shows each type of
unauthorized access and measures to be taken against it.
Note
• New unauthorized access methods and security loopholes
(security holes) are constantly being discovered. We would
like you to understand that there is no completely infallible
security measures that can solve all the problems, and
that connecting to the Internet always involves risk. The
functions included in the product are no exception. Thus,
we strongly recommend that you constantly obtain the latest
information and enhance the security settings under your own
responsibility.
• Please note that Yamaha cannot accept any liability for any
losses or damage resulting from incorrect use.
1. Intrusions using invalid packets
• The most effective action is disconnecting the Internet
or changing the global IP address.
• Using a packet ltering rewall to block unwanted
packets is also effective to a certain extent.
• It is also considerably effective to use the rewall
software of application gateway type because it blocks
inconsistent packets, or dubious ActiveX and Java
applets from entering PCs. Virus detection software can
be used in combination with it. In this case, however,
you should set up a rewall server where to install the
rewall software of application gateway type.
Measures to be taken in the product
• Enable the auto-disconnect function so that an assigned
dynamic IP address can be changed each time the product
is disconnected/connected. However, this measure is
difcult to implement when you use the product for the
purpose of having a public server in place. In that case,
take appropriate measures in the server.
• You may be able to block a certain type of attack by
conguring a lter to block specic types of packets
(page 96) used for the attack.
2. Intrusions exploiting security holes
of the operating system or server
software
This type of unauthorized access can be prevented at a high
rate by upgrading the operating system or server software,
configuring proper settings, or conducting adequate
management.
Measures to be taken in the product
• Changing a product setting by malicious third persons
can be prevented by restricting hosts that can change the
product settings (page 100).
• You may be able to block a certain type of attack by
conguring a lter to block specic types of packets
(page 96) used for the attack.
3. Intrusions as e-mail attachment
files (computer viruses)
Your PC is infected with a virus by opening an attached
le. Do not open any dubious attachment les, and install
virus detection software on PCs to detect viruses and clean
them at an early stage so that damage can be minimized.
Measures to be taken in the product
• Security enhancement functions included in the product
are not effective against computer viruses.
• Prepare PC virus detection software separately.
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