Draytek Vigor2620 LTE Series User Manual page 121

Configuration
DNS Server IP Address
Vigor2620 Series User's Guide
router by factory default acts a DHCP server for your network
so it automatically dispatch related IP settings to any local
user configured as a DHCP client. It is highly recommended
that you leave the router enabled as a DHCP server if you do
not have a DHCP server for your network.
Disable Server – Let you manually assign IP address to every
host in the LAN.
Enable Server - Let the router assign IP address to every host
in the LAN.
Start IP Address - The beginning LAN IP address that is

given out to LAN DHCP clients.
IP Pool Counts - The maximum number of IP addresses

to be handed out by DHCP. The default value is 100.
Valid range is between 1 and 253. The actual number of
IP addresses available for assignment is the IP Pool
Counts, or 253 minus the last octet of the Start IP
Address, whichever is smaller.
Gateway IP Address - The IP address of the gateway,

which is the host on the LAN that relays all traffic
coming into and going out of the LAN. The gateway is
normally the router, and therefore the Gateway IP
Address should be identical to the IP Address in the
Network Configuration section above.
 Lease Time - The maximum duration DHCP-issued IP
addresses can be used before they have to be renewed.
Clear DHCP lease for inactive clients periodically - If

selected, the router sends ARP requests recycles IP
addresses previously assigned to inactive DHCP clients
to prevent exhaustion of the IP address pool.
Note: When Clear DHCP lease for inactive clients
periodically is enabled, router will do the following:
Check activities of DHCP clients by ARP requests

every minute when the available DHCP IP
addresses are less than 30
 Clear DHCP lease when the client is not
responding ARP replies.
Enable Relay Agent – When selected, all DHCP requests are
forwarded to a DHCP server outside of the LAN subnet, and
whose address is specified in the DHCP Server IP Address
field.
DHCP Server IP Address – It is available when Enable

Relay Agent is checked. Set the IP address of the DHCP
server you are going to use so the Relay Agent can help
to forward the DHCP request to the DHCP server.
DNS stands for Domain Name System. Every Internet host
must have a unique IP address, also they may have a
human-friendly, easy to remember name such as
www.yahoo.com. The DNS server converts the user-friendly
name into its equivalent IP address.
Primary IP Address -You must specify a DNS server IP address
here because your ISP should provide you with usually more
than one DNS Server.
Secondary IP Address - You can specify secondary DNS server
IP address here because your ISP often provides you more
than one DNS Server.
The default DNS Server IP address can be found via Online
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