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Detail Settings
Authorized/Restricted Host List Descriptions
The Host Restriction function applies to hosts running client applications such as viewer. Access
restrictions are imposed using a list made up of one or more entries written using the format
described below.
Listing Format
[!]addr[-addr2]
● "addr" is written in standard IP address format.
● Because the IP addresses in the “addr” and “addr2” parameters define the range of IP
addresses, if an IP address A is higher than “addr” or lower than “addr2”, A is included in the
addr-addr2 range. The addr2 parameter can be omitted, in which case it is taken to be the
same value as addr.
● For a host IP address A for which access permission is to be authorized or restricted, the first
entry that includes A is requested from the top of the list of authorized/restricted hosts. If the
entry obtained begins with “!”, access is denied. If not, access is authorized.
● Redundant or contradictory entries included in the list are automatically deleted.
● If the given address does not belong to any of the entries, access is authorized.
Listing Guidelines
If the list of authorized and restricted hosts contains an error, access that was originally permitted
may subsequently be denied. To avoid this problem, compile the lists very carefully using the
examples below as a guide.
Example 1: To prohibit access from a host
!172.20.0.0
Access from the host with an IP address of 172.20.0.0 is prohibited.
Example 2: To prohibit access from hosts in a given address range
!172.20.0.0-172.20.0.20
Access from hosts with IP addresses from 172.20.0.0 to 172.20.0.20 is prohibited.
Example 3: To authorize access from hosts in a given address range while prohibiting
access from other hosts
172.20.0.10-172.20.0.12
!0.0.0.0-255.255.255.255
Access is only authorized from hosts with IP addresses from 172.20.0.10 to
172.20.0.12.
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