Preventing Unauthorized Access0X7U-03SThis section describes the security measures on how to prevent unauthorized access from the external network. This isa must-read for all users and administrators before using this machine, other printers, and multifunction machinesconnected to the network. In recent years, a printer/multifunction machine connected to the network can offer you avariety of useful functions, such as printing from a computer, operating from a computer using the remote function,and sending scanned documents via the Internet. On the other hand, it is essential to take security measures toreduce the security risk for information leakage, as a printer/multifunction machine has become more exposed tothreats, such as unauthorized access and theft, when it is connected to the network. This section explains necessarysettings you need to specify to prevent unauthorized access before using a printer/multifunction machine connectedto the network.Security Measures to Prevent Unauthorized Access from the External NetworkAssigning a Private IP Address(P. 250)Using Firewall to Restrict Transmission(P. 251)Specifying the TLS Encrypted Communication (P. 251)Setting PIN to Manage Information Stored in the Printer(P. 251)Assigning a Private IP AddressAn IP address is a numerical label assigned to each device participating in a computer network. A "global IP address" isused for the communication connecting to the Internet, and a "private IP address" is used for the communicationwithin a local area network, such as a LAN in the company. If a global IP address is assigned, your printer/multifunction machine is open to the public and can be accessed via the Internet. Thus, the risk of information leakagedue to unauthorized access from external network increases. On the other hand, if a private IP address is assigned,your printer/multifunction machine is closed to a local area network and can be accessed by only users on your localarea network, such as a LAN in the company.Global IP AddressCan be accessed from the users within a local areanetworkPrivate IP AddressCan be accessed from the users within a local area networkBasically, assign a private IP address to your printer/multifunction machine. Make sure to confirm the IP address,assigned to the printer/multifunction machine you are using, is a private IP address or not. A private IP address isfound in one of the following ranges.Ranges for Private IP addresses● From 10.0.0.0 to 10.255.255.255● From 172.16.0.0 to 172.31.255.255● From 192.168.0.0 to 192.168.255.255For information on how to confirm the IP address, see Setting IPv4 Address(P. 188) .● If a global IP address is assigned to a printer/multifunction machine, you can create a network environmentto reduce the risk of unauthorized access by installing security software, such as a firewall that preventsSecurity250
