By default, all IP addresses are granted access to DMZ Gateway. You can grant access to only one specific IP address or a range of IP addresses, or deny access to one specific address or a range of addresses. You can define up to 100 IP address masks.
For example, if you want to allow only 192.168.174.159 and block every other IP address, click Denied access, click Add, then type 192.168.174.159 in the IP mask box. This will deny access to all IP addresses except 192.168.174.159.
To grant/deny access by IP Address
In the Profile tree, click the default Profile or create a new profile.
In the Configuration pane, click the Access tab. The exception list appears.
The Access tab displays the IP addresses that are granted or denied access. By default, all IP addresses are granted access, and no exceptions are displayed in the list.
To configure exceptions, click Granted access or Denied access.
If most IP addresses are allowed access, click Granted access, then add the exceptions (IP addresses that are not allowed access).
If most IP addresses are denied access, click Denied access, then add the exceptions (IP addresses that are allowed access).
Click Add. The New IP Access Exception Entry dialog box appears.
Specify the IP address or range of IP addresses to which you are denying or granting access. You can use wildcards to select ranges of IP addresses.
Click OK. The IP address/mask appears in the exceptions list.
Click Apply Changes to save the changes on DMZ Gateway.