MicroNet Technology SP5001A/S - Manual (Page 45)

can enable the UPnP function.
IP Sharing Server
Address
Enter the public Internet IP address here, if the gateway behinds
the NAT router.
Primary DNS
Server
Enter the primary Domain Name Server IP address here.
If the gateway connects to the server by URL address, DNS must
configure.
DNS is the Domain Name System. DNS converts machine names
to the IP addresses that all machines on the net have. It translates
from name to address and from address to name. For example
www.micronet.info
Secondary DNS
Server
Enter the secondary Domain Name Server IP address here.
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