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Chapter 6 Broadband
Table 8 Network Setting > Broadband > Add New WAN Interface/Edit (Routing Mode) (continued)
LABEL
Static IP
Address
IP Address
Subnet
Mask
Gateway IP
Address
Routing Feature (This is available only when you select IPv4 Only or IPv6/IPv4 DualStack in the IPv6/
IPv4 Mode field.)
NAT Enable
Full cone NAT
enable
IGMP Proxy
Enable
Apply as
Default
Gateway
DNS Server (This is available only when you select IPv4 Only or IPv6/IPv4 DualStack in the IPv6/IPv4
Mode field.)
DNS
Primary DNS
server
Secondary DNS
server
DHCPC
Request Option
Sent Options
74
DESCRIPTION
Select this option If the ISP assigned a fixed IP address.
Enter the static IP address provided by your ISP.
Enter the subnet mask provided by your ISP.
Enter the gateway IP address provided by your ISP.
Select this option to activate NAT on this connection.
Select this option to enable full cone NAT on this connection. This field is available only when
you activate NAT. In full cone NAT, the VMG maps all outgoing packets from an internal IP
address and port to a single IP address and port on the external network. The VMG also
maps packets coming to that external IP address and port to the internal IP address and
port.
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.
Select this option to have the VMG act as an IGMP proxy on this connection. This allows the
VMG to get subscribing information and maintain a joined member list for each multicast
group. It can reduce multicast traffic significantly.
Select this option to have the VMG use the WAN interface of this connection as the system
default gateway.
Select Obtain DNS Info Automically if you want the VMG to use the DNS server
addresses assigned by your ISP.
Select Use Following Static DNS Address if you want the VMG to use the DNS server
addresses you configure manually.
Enter the first DNS server address assigned by the ISP.
Enter the second DNS server address assigned by the ISP.
VMG uses DHCPC to get its configuration parameters from a Dynamic Host Configuration
Protocol (DHCP) server. It broadcasts a DHCP discover message on the default (first)
network interface. It then waits for an offer from a DHCP server. On receiving an offer,
DHCPC configures the VMG with the IP address, broadcast address, and network mask
which it has obtained from the DHCP server. DHCPC uses vendor entries in the configuration
file to format this data.
Specify the option type to be requested from the DHCP server.
•
DHCP option 43 (vendor specific information). Each vendor is identified by a vendor
string. When the VMG makes a request with option 43 using the vendor string and a list
of requested vendor specific options, the DHCP server replies with option 43, that
includes the vendor string and a list of associated options.
•
Option 121, also referred to as classless static route option, allows assigning any static
route via DHCP.
Specify the option type(s) to be sent to the DHCP server.
•
DHCP Option 50 (Requested IP Address): Use this option if you want the VMG to request
that a particular IP address be assigned.
•
DHCP Option 51 (IP Address Lease Time): Use this option if you want the VMG to request
a lease time for the IP address. The DHCP server uses this option to specify the lease
time it will offer.
VMG5313-B10A/-B30A Series User's Guide
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