You can modify firewall interface details using the firewall service blade setup wizard or using the Modify button in the Configure Firewall Interface(s) option in the Firewall menu.
For the Firewall Service Blade Setup Wizard:
Right-click the blade, then select Firewall Service Blade Setup Wizard. The Firewall Service Blade Setup Wizard appears.
Click Next till the Configure Firewall Interfaces option, in the left pane, is selected. The Firewall Configuration details appear on the right pane.
Select a row, then click Modify.
For the Firewall menu:
Right-click the device, then select Configure Firewall Interface(s). The firewall interface details are displayed.
Select a row, then click Modify.
The following information appears:
Number assigned to the VLAN.
Name of the firewall interface.
Security level of the interface. You can change the security level.
IP address assigned to the VLAN.
Subnet mask of the VLAN IP address.