Automatically Setting the IP Address to Restrict Access to this Machine

If the quick IP filtering function is employed, the range of the IP addresses accessible to this machine is set automatically, enabling you to quickly specify access restrictions.

  1. In the administrator mode, select [Network] - [TCP/IP Setting] - [Quick IP Filtering], then configure the following settings.

    Settings

    Description

    [Quick IP Filtering]

    Select the method to determine the range to restrict addresses.

    • [Synchronize IP Address]: For the IPv4 address, this option only permits access for the IPv4 address set to this machine, and the IPv4 addresses of which the high-order 3 bytes are the same.
      Example: When the IPv4 address of this machine is set to "192.168.0.134", the range of IPv4 addresses that allow access is as follows.
      192.168.0.0 to 192.168.0.255
      For the IPv6 address, this option only permits access for the global unicast address (2000::/3). Also, this option only permits access for the IPv6 address set to this machine, and the IPv6 addresses of which the high-order 64 bits are the same.
      Example: When the IPv6 address of this machine is set to "2345:1:2:3:4:5:6:7", the range of IPv6 addresses that allow access is as follows.
      2345:1:2:3::0 to 2345:1:2:3:FFFF:FFFF:FFFF:FFFF

    • [Synchronize Subnet Mask]: For the IPv4 address, this option only permits access for IPv4 addresses that belong to the same network using the IPv4 address set to this machine and subnet mask.
      If no subnet mask is set or "0.0.0.0" is specified, this option permits the IPv4 address set to this machine, and the IPv4 addresses each of which only the suffix is different. This results in the same operation as for [Synchronize IP Address].
      Example: When the IPv4 address of this machine is set to "192.168.17.134" and the subnet mask is set to "255.255.252.0", the range of IPv4 addresses that allow access is as follows.
      192.168.16.*** to 192.168.19.***
      For the IPv6 address, this option only permits access for the global unicast address (2000::/3). Also, filtering is carried out using the global IPv6 address set to this machine and prefix.
      If the prefix is not specified, filtering is carried out in the same way as when the 64-bit prefix is specified.
      Example: When the IPv6 address of this machine is set to "2345:1:2:3:4:5:6:7" and Prefix is set to "/64", the range of IPv6 addresses that allow access is as follows.
      2345:1:2:3::0 to 2345:1:2:3:FFFF:FFFF:FFFF:FFFF

    • [No Filtering]: Does not use the filtering function.

    [No Filtering] is specified by default. In some area, [Synchronize IP Address] is set by default.

  2. Click [Network] - [TCP/IP Setting] - [Filtering Type], select [Quick IP Filtering], then click [OK].

Tips

  • If the quick IP filtering function is used, the range of IP addresses for which access is to be restricted is specified automatically. To manually specify the range of IP addresses for which access is to be restricted, set [Network] - [TCP/IP Setting] - [IP Address Filtering] or [Packet Filtering] instead of using [Quick IP Filtering].