Preventing Unauthorized Access
13WK-002
This section describes preventive measures against unauthorized access from external networks. For administrators
and users that are using the machine in a network environment, make sure to read this section before use.
Connecting to networks enables you to use various functions such as printing, remote operation from a computer,
sending scanned documents through the Internet, etc. However, for protection against unauthorized access from an
external network, security measures are essential. This section describes some countermeasures against unauthorized
access, which must be implemented before using the machine with a network environment.
Implementing Private IP Addresses(P. 5)
Limiting Communication via a Firewall(P. 6)
Setting up TLS Encryption Communication(P. 6)
Managing the Machine's Information via Passwords(P. 6)
Implementing Private IP Addresses
An IP address is a number that is assigned to a computer on a network. A "global IP address" is used for Internet
connections. A "private IP address" is used for local area networks such as an oce LAN. If your IP address is a global
IP address, unauthorized users on the Internet can attempt to access your local network and risks such as information
leakage become larger. If your address is a private address, only users on a local area network such as the oce LAN
have access.
【Global IP address】
Accessible from outside your network
【Private IP address】
Accessible only from within a local area network
Generally, when setting up an IP address, use a private IP address. For a private IP address, any addresses in the
following ranges can be used. Conrm if the IP address that is currently set is a private IP address.
◼ Ranges of Private IP Addresses
● 10.0.0.0 to 10.255.255.255
● 172.16.0.0 to 172.31.255.255
● 192.168.0.0 to 192.168.255.255
For information on how to conrm IP addresses, see
Setting an IPv4 Address(P. 33) .
● Even if a global IP address is set for the machine, risk of unauthorized access can be reduced by using a
rewall. Consult your network administrator when you want to operate the machine using a global IP
address.
Setting Up
5
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