Industry Cellular Gateway
Staff) with NAT mode and DHCP-2 server equipped. At last, administrator also configure Data Center segment
with VLAN ID 1. The VLAN group includes Port-1 with NAT mode to WAN interface as shown in following
diagram.
Above is the general case for 3 Ethernet LAN ports in the gateway. But if the device just has one Ethernet LAN
port, there will be only one VLAN group for the device. Under such situation, it still supports both the NAT and
Bridge mode for the Port-based VLAN configuration.
Tag-based VLAN
Tag-based VLAN function can group Ethernet ports, Port-1 ~ Port-4, and WiFi Virtual Access Points, VAP-1 ~
VAP-8, together with different VLAN tags for deploying subnets in Intranet. All packet flows can carry with
different VLAN tags even at the same physical Ethernet port for Intranet. These flows can be directed to
different destination because they have differentiated tags. The approach is very useful to group some hosts
at different geographic location to be in the same workgroup.
Tag-based VLAN is also called a VLAN Trunk. The VLAN Trunk collects all packet flows with different VLAN IDs
from Router device and delivers them in the Intranet. VLAN membership in a tagged VLAN is determined by
VLAN ID information within the packet frames that are received on a port. Administrator can further use a
VLAN switch to separate the VLAN trunk to different groups based on VLAN ID. Following is an example.
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