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.
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 click New to create a new profile. (Creating a new Profile is available only in DMZ Gateway Enterprise.)
Click IP Ban/Allow List. The IP Ban/Allow List appears.
The dialog box displays the IP addresses that are granted or denied access. By default, all IP addresses are granted access, so when Granted access is selected, no exceptions are displayed below.
Click Granted access or Denied access.
If most IP addresses are allowed access, click Granted access, then add the exceptions.
If most IP addresses are denied access, click Denied access, then add the exceptions.
Click Add. The IP Mask 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 to close the IP Mask dialog box. The IP address/mask appears in the exceptions list.
Click OK to close the IP Access/Ban List dialog box.
Click Apply to save the changes on DMZ Gateway.