Dell W-Series 277 Instant 6.4.3.1-4.2 User Guide - Page 241
Distributed L2 Mode, Centralized L2 Mode, corporate network to clients on this subnet in the branch.
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Distributed L2 Mode In this mode, the W-IAP assigns an IP address from the configured subnet and forwards traffic to both corporate and non-corporate destinations. Clients receive the corporate IP with Virtual Controller as the DHCP server. The default gateway for the client still resides in the datacenter and hence this mode is an L2 extension of corporate VLAN to remote site. Either the controller or an upstream router can be the gateway for the clients. Client traffic destined to datacenter resources is forwarded by the Master AP (through the IPSec tunnel) to the client's default gateway in the datacenter. When a W-IAP registers with the controller, the controller automatically adds the VPN tunnel associated to this W-IAP into the VLAN multicast table. This allows the clients connecting to the L2 mode VLAN to be part of the same L2 broadcast domain on the controller. Distributed L3 Mode The distributed L3 mode contains all broadcast and multicast traffic to a branch. The distributed L3 mode reduces the cost and eliminates the complexity associated with the classic site-to-site VPN. However, this mode is very similar to a classic site-to-site IPsec VPN where two VPN endpoints connect individual networks together over a public network. In distributed L3 mode, each branch location is assigned a dedicated subnet. The master AP in the branch manages the dedicated subnet and acts as the DHCP server and gateway for clients. Client traffic destined to datacenter resources is routed to the controller through the IPsec tunnel, which then routes the traffic to the appropriate corporate destinations. When a W-IAP registers with the controller, the Controller adds a route to enable the routing of traffic from the corporate network to clients on this subnet in the branch. Centralized L2 Mode The centralized L2 mode extends the corporate VLAN or broadcast domain to remote branches. The DHCP server and the gateway for the clients reside in the datacenter. Either the controller or an upstream router can be the gateway for the clients. For DHCP services in centralized L2 mode, it is recommended that you use an external DHCP server and not the DHCP server on the controller. Client traffic destined to datacenter resources is forwarded by the master W-IAP (through the IPsec tunnel) to the client's default gateway in the datacenter. Centralized L3 Mode For centralized L3 clients, the virtual controller acts as a DHCP relay agent that forwards the DHCP traffic to the DHCP server located behind the controller in the corporate network and reachable through the IPSec tunnel. The centralized L3 VLAN IP is used as the source IP. The IP address is obtained from the DHCP server. Dell Networking W-Series Instant 6.4.3.1-4.2.0.0 | User Guide IAP-VPN Deployment | 241