Chapter 6 Broadband
VMG/XMG Series User’s Guide
128
Secondary DNS
Server
Enter the second DNS server address assigned by the ISP.
Routing Feature (This is available only when you select IPv4 Only or IPv4 IPv6 DualStack in the IPv4/IPv6 Mode field.)
NAT Click this switch to activate or deactivate NAT on this connection. When the switch goes to the
right , the function is enabled. Otherwise, it is not.
IGMP Proxy Internet Group Multicast Protocol (IGMP) is a network-layer protocol used to establish
membership in a Multicast group - it is not used to carry user data.
Click this switch to have the Zyxel Device act as an IGMP proxy on this connection. When the
switch goes to the right , the function is enabled. Otherwise, it’s not.
This allows the Zyxel Device to get subscribing information and maintain a joined member list for
each multicast group. It can reduce multicast traffic significantly.
Apply as Default
Gateway
Click this switch to have the Zyxel Device use the WAN interface of this connection as the system
default gateway. When the switch goes to the right , the function is enabled. Otherwise, it is
not.
Fullcone NAT
Enable
Click this switch to enable or disable full cone NAT on this connection. When the switch goes to
the right , the function is enabled. Otherwise, it’s not.
This field is available only when you activate NAT.
In full cone 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 (This is available only when you select IPv4 Only or IPv4 IPv6 DualStack in the IPv4/IPv6 Mode field.)
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 (This is available only when you select IPv4 IPv6 DualStack or IPv6 Only in the IPv4/IPv6 Mode field.)
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.
Table 31 Network Setting > Broadband > Add/Edit New WAN Interface (Routing Mode)
LABEL DESCRIPTION
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