Configure DHCP Domain Name (for Security Firewalls in Nebula)
You can configure a DHCP domain name to map to a specific IP address on a specific interface. For this example, to add a domain name for the IP address 192.168.8.1 in the lan1 interface, do the following.
1 Go to Firewall > Configure > Interface. Click the Edit icon for the lan1 interface to open the Site-wide > Configure > Firewall > Interface > LAN interface configuration screen.
2 Click ADVANCED OPTIONS. Then click +Add new to open the Site-wide > Configure > Firewall > Interface > LAN interface configuration: DHCP option screen.
3 Select
User defined as the DHCP
Option that you want to add in the DHCP packets sent through the LAN interface. Select
TEXT for the
Type, enter a descriptive
Name to identify and the
Code number of the selected DHCP option (
15, for setting the Domain Name). See
https://www.iana.org/assignments/bootp-dhcp-parameters/bootp-dhcp-parameters.xhtml for the list of code numbers. Enter the DNS domain name of the IP address in
Value. Then click
OK.
4 A new user-defined DHCP option appears in LAN interface configuration. Click OK.
5 Go to Site-wide > Configure > Firewall > Firewall settings and click +Add in DNS to create an Address Record. This record specifies the mapping of a Fully-Qualified Domain Name (FQDN) to an IP address.
6 Enter the FQDN (cs.com) and IP Address (192.168.8.1). Then click Save to finish mapping the FQDN to the IP address.
To check if the domain name configuration is successful.
1 Connect a computer to the lan1 interface (with IP address 192.168.8.1).
2 Run the Command Prompt and enter ipconfig. Check the value for Connection-specific DNS Suffix to confirm.