Comtrend Corporation NexusLink 3120 User Manual page 185

USE STATIC IPv4 ADDRESS
Unless your service provider specially requires it, do not select this checkbox . If
selected, enter the static IP address in the IPv4 Address field.
Don't forget to adjust the IP configuration to Static IP Mode as described in section
3.2 IP Configuration.
FIXED MTU
Maximum Transmission Unit. The size (in bytes) of largest protocol data unit which
the layer can pass onwards. This value is 1492 for PPPoE.
ENABLE PPP DEBUG MODE
When this option is selected, the system will put more PPP connection information
into the system log. This is for debugging errors and not for normal usage.
BRIDGE PPPOE FRAMES BETWEEN WAN AND LOCAL PORTS
(This option is hidden when PPP IP Extension is enabled)
When Enabled, this creates local PPPoE connections to the WAN side. Enable this
option only if all LAN-side devices are running PPPoE clients, otherwise disable it.
The NexusLink 3120 supports pass-through PPPoE sessions from the LAN side while
simultaneously running a PPPoE client from non-PPPoE LAN devices.
ENABLE IGMP MULTICAST PROXY
Tick the checkbox  to enable Internet Group Membership Protocol (IGMP)
multicast. This protocol is used by IPv4 hosts to report their multicast group
memberships to any neighboring multicast routers.
ENABLE IGMP MULTICAST SOURCE
Enable the WAN interface to be used as IGMP multicast source.
Enable WAN interface with base MAC
Enable this option to use the router's base MAC address as the MAC address for this
WAN interface.
STEP 3: Choose an interface to be the default gateway.
Click Next to continue or click Back to return to the previous step.
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