Interfaces in non-management VDOMs as the source IP address of the DNS conditional forwarding server 7.4.1

This information is also available in the FortiOS 7.4 Administration Guide: Interfaces in non-management VDOMs as the source IP address of the DNS conditional forwarding server

Interfaces that are in non-management VDOMs can be the source IP address of the DNS conditional forwarding server.

• When vdom-dns is enabled in a VDOM, only the IP addresses of interfaces in that VDOM can be configured as the source-ip.

• When vdom-dns is disabled (default), only the IP address of interfaces in the management VDOM can be configured as the source-ip.

In this example:

• vdom1 is a non-management VDOM

• port8 is assigned to vdom1 and has IP address 13.13.13.13

• port1 is assigned to the management VDOM (root) and has IP address 172.16.200.1

To configure the interfaces:

config global
    config system interface
        edit "port8"
            set vdom "vdom1"
            set ip 13.13.13.13 255.255.255.0
        next
        edit "port1"
            set vdom "root"
            set ip 172.16.200.1 255.255.255.0  
        next
    end
end

To test configuring a source IP address when vdom-dns is disabled:

config vdom
    edit vdom1
        config system vdom-dns
            set vdom-dns disable
        end
    next
end

• port8 cannot be used as the source IP address in a DNS database because it is assigned to vdom1, and not to a management VDOM:

  config vdom
      edit vdom1
          config system dns-database
              edit "1"
                  set source-ip 13.13.13.13
  13.13.13.13 does not match any interface ip in vdom root.
  node_check_object fail! for source-ip 13.13.13.13

• port1 can be used as the source IP address in a DNS database because it is assigned to the management VDOM:

  config vdom
      edit vdom1
          config system dns-database
              edit "1"
                  set source-ip 172.16.200.1
              next
          end
      next
  end

To test configuring a source IP address when vdom-dns is enabled:

config vdom
    edit vdom1
        config system vdom-dns
            set vdom-dns enable
        end
    next
end

• port8 can be used as the source IP address in a DNS database because it is assigned to the vdom1:

  config vdom
      edit vdom1
          config system dns-database
              edit "1"
                  set source-ip 13.13.13.13
              next
          end
      next
  end

• port1 cannot be used as the source IP address in a DNS database because it is assigned to the management VDOM, and not to vdom1:

  config vdom
      edit vdom1
          config system dns-database
              edit "1"
                  set source-ip 172.16.200.1
  172.16.200.1 does not match any interface ip in vdom vdom1.
  node_check_object fail! for source-ip 172.16.200.1