Internal/External Vlan Add/Edit - ZyXEL Communications USG FLEX H Series User Manual

Table 61 Network > Interface > Interface > External/Internal > Add (Ethernet)
LABEL
Default SNAT
Apply
Reset

7.3.2 Internal/External VLAN Add/Edit

A Virtual Local Area Network (VLAN) divides a physical network into multiple logical networks. The
standard is defined in IEEE 802.1q.
Figure 86 Example: Before VLAN
In this example, there are two physical networks and three departments A, B, and C. The physical
networks are connected to hubs, and the hubs are connected to the router.
Alternatively, you can divide the physical networks into three VLANs.
Figure 87 Example: After VLAN
Each VLAN is a separate network with separate IP addresses, subnet masks, and gateways. Each VLAN
also has a unique identification number (ID). The ID is a 12-bit value that is stored in the MAC header. The
VLANs are connected to switches, and the switches are connected to the router. (If one switch has
enough connections for the entire network, the network does not need switches A and B.)
• Traffic inside each VLAN is layer-2 communication (data link layer, MAC addresses). It is handled by
the switches. As a result, the new switch is required to handle traffic inside VLAN 2. Traffic is only
broadcast inside each VLAN, not each physical network.
Chapter 7 Interfaces
DESCRIPTION
This field appears when Role is set to External.
Select this to have the Zyxel Device use the IP address of the outgoing interface as the
source IP address of the packets it sends out through its WAN trunks. The Zyxel Device
automatically adds SNAT settings for traffic it routes from internal interfaces to external
interfaces.
Click Apply to save your changes back to the Zyxel Device.
Click Reset to return the screen to its last-saved settings.
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