QNAP Security VioStor CMS (Version: 1.0.1) - Manual (Page 160)

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Note:
 Do not enable DHCP server if there is already one on the local network to avoid IP
address conflicts or network access errors.
 The DHCP server option is available to Ethernet 1 only when both LAN ports of a dual
LAN CMS Server are connected to the network and configured as standalone IP
settings.
Start IP, End IP, and Lease Time: Set the range of IP addresses allocated by the CMS
Server to the DHCP clients and the lease time. The lease time refers to the time that an IP
address is leased to the clients. During that time, the IP will be reserved to the assigned
client. When the lease time expires, the IP can be assigned to another client.
(ii) Default Gateway
Select the gateway settings. Please be reminded to select the first LAN port for the default
gateway if both LAN ports are connected to the network.
(iii) DNS Server
Primary DNS Server: Enter the IP address of the primary DNS server. This server will
provide the DNS service to dissolve domain names of the external network for the CMS
Server.
Secondary DNS Server: Enter the IP address of the secondary DNS server. This server will
be the second server to provide the DNS service for the CMS Server.
Note:
 Please contact the ISP or network administrator for the IP address of the primary and
the secondary DNS servers. When the CMS Client needs the domain name to connect
to the CMS Server, the client needs at least one DNS server IP for proper URL
connection. Otherwise, the function may not work properly.
 If you select to obtain the IP address by DHCP, there is no need to configure the
primary and the secondary DNS servers. In this case, enter “0.0.0.0”.
5.2.2 DDNS
To allow remote access to the CMS Server using a domain name instead of a dynamic IP
address, enable the DDNS service.