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Enable IP Filter
Check the box to enable the IP Filter function. Once enabled, the listed IP addresses (IPv4) in the
Filtered IP Addresses list box will be allowed/denied to access the camera.
Select Allow or Deny from the drop-down menu and click on Apply to determine the IP filter beha-
vior.
Add IP Address
Input IP address at the blank space below the Filtered IP Address list and click Add. The newly-
added address will be shown in the list. Up to 256 IP address entries can be specified.
In addition, to filter a group of IP addresses, enter an address at the blank space followed with a
slash and a number ranging from 1 to 31, e.g. 192.168.2.81/30. The number after the slash can
define how many IP addresses will be filtered. For details, please refer to Example: Filtering a Group
of Consecutive IP Addresses, p. 49 below.
Delete IP Address
To remove an IP address from the Filtered IP Address list, select the address and click on Delete.
Example: Filtering a Group of Consecutive IP Addresses
1. Convert 192.168.2.81/30 to binary numbers (see Appendix B: Converting IP Addresses from
Decimal to Binary, p. 106). The binary numbers are 11000000.10101000.00000010.01010001. The
number “30” after the slash is referring to the first 30 digits of the binary numbers.
2. Convert a few IP addresses before and after 192.168.2.81 to binary numbers. Then compare
their first 30 digits with the binary numbers of 192.168.2.81.
1. Convert 192.168.2.80 to binary numbers. The binary numbers are
11000000.10101000.00000010.01010000. The first 30 digits are the same with the binary
numbers of 192.168.2.81, thus 192.168.2.80 will be filtered.
2. Convert 192.168.2.79 to binary numbers. The binary numbers are
11000000.10101000.00000010.01001111. The first 30 digits are different with the binary num-
bers of 192.168.2.81, thus 192.168.2.79 will not be filtered. This also means the IP addresses
before 192.168.2.79 will not be filtered. Therefore, you can stop converting the IP addresses
before 192.168.2.79 to binary numbers.
3. Repeat the same procedure in “a” with the IP addresses after 192.168.2.81. Stop when the
situation occurs in “b” happened. Namely, the 30th digit of the binary numbers of IP
address 192.168.2.84 is different, and will not be filtered.
As a result, the IP addresses 192.168.2.80 to 192.168.2.83 will be filtered when entering
192.168.2.81/30. The following table clearly shows the 30
th
digit of the binary numbers of IP
Menu Reference
The “System” Tab
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