Chapter 6 Broadband
LTE Series User’s Guide
88
Fullcone NAT Click this switch to enable or disable fullcone NAT on this connection. When the switch goes to 
the right  , the function is enabled. Otherwise, it is not.
This field is available only when you activate NAT.
In fullcone NAT, the Zyxel Device maps all outgoing packets from an internal IP address and port 
to a single IP address and port on the external network. The Zyxel Device also maps packets 
coming to that external IP address and port to the internal IP address and port.
DHCPC Options
Request Options Select Option 43 to have the Zyxel Device automatically add vendor specific information in the 
DHCP packets to request the vendor specific options from the DHCP server.
Select Option 120 to have the Zyxel Device get the IP address or a fully-qualified domain name 
of SIP server from DHCP.
Select Option 121 to have the Zyxel Device push static routes to clients.
Sent Options
option 60 Select this and enter the device identity you want the Zyxel Device to add in the DHCP discovery 
packets that go to the DHCP server.
Vendor ID Enter the Vendor Class Identifier, such as the type of the hardware or firmware.
option 61 Select this and enter any string that identifies the device.
IAID Enter the Identity Association Identifier (IAID) of the device, for example, the WAN connection 
index number.
DUID Enter the hardware type, a time value and the MAC address of the device.
option 125 Select this to have the Zyxel Device automatically generate and add vendor specific 
parameters in the DHCP discovery packets that go to the DHCP server.
IPv6 Address 
Obtain an IPv6 
Address 
Automatically
Select Obtain an IPv6 Address Automatically if you want to have the Zyxel Device use the IPv6 
prefix from the connected router’s Router Advertisement (RA) to generate an IPv6 address.
Static IPv6 
Address
Select Static IPv6 Address if you have a fixed IPv6 address assigned by your ISP. When you select 
this, the following fields appear.
IPv6 Address Enter an IPv6 IP address that your ISP gave to you for this WAN interface.
Prefix Length Enter the address prefix length to specify how many most significant bits in an IPv6 address 
compose the network address.
IPv6 Default 
Gateway
Enter the IP address of the next-hop gateway. The gateway is a router or switch on the same 
segment as your Zyxel Device's interface(s). The gateway helps forward packets to their 
destinations.
IPv6 DNS Server
Obtain IPv6 DNS 
Info 
Automatically
Select Obtain IPv6 DNS Info Automatically to have the Zyxel Device get the IPv6 DNS server 
addresses from the ISP automatically.
Use Following 
Static IPv6 DNS 
Address
Select Use Following Static IPv6 DNS Address to have the Zyxel Device use the IPv6 DNS server 
addresses you configure manually.
Primary DNS 
Server
Enter the first IPv6 DNS server address assigned by the ISP.
Secondary DNS 
Server
Enter the second IPv6 DNS server address assigned by the ISP.
IPv6 Routing Feature
Table 20   Network Setting > Broadband > Add/Edit New WAN Interface (continued)
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