232 | VPN Configuration Dell PowerConnect W-Series Instant Access Point 6.1.3.4-3.1.0.0 | User GuideFigure 211 Distributed L3 DHCP ConfigurationCentralized L2 DHCP ConfigurationIn Centralized L2 mode, both the DHCP server and default gateway are in the data center, on the other side ofthe VPN tunnel.1. Click New in the DHCP Server window and select Centralized, L2 to configure the following parameters forDistributed L3 mode DHCP pool: Name — Name of the subnet (must be unique). Type— Indicates the type of DHCP server. Available options are Local, Distributed L3, Distributed L2,Centralized L2. Centralized, L2 implies that this is a Centralized mode L2 DHCP subnet. VLAN— VLAN ID of the subnet. This needs to be referenced in the SSID configuration to make use ofthis subnet. DHCP RelayDHCP Relay Agent and Option 82— Select to enable or disable these features.When a DHCP server is configured with a DHCP Relay agent, the client's Broadcast DHCP Discoverpacket is not sent to the corporate network, instead the Virtual Controller acts as the DHCP Relay andunicasts DHCP packets to the corporate DHCP server. Enable DHCP Option 82 to allow clients to sendDHCP packets with the Option 82 string.The Option 82 string is available only in the Alcatel (ALU) format. The ALU format for the Option 82string consists of the following: Remote Circuit ID — AP-MAC; SSID; SSID-Type Remote Agent — IDUE-MACThe following table describes the behavior of DHCP Relay Agent and Option 82 in the IAP.NOTE: The Option 82 is specific to Alcatel and is not configurable in this version of Instant.Table 44 Ports used by the Apple Facetime ApplicationDHCP Relay Option82 BehaviorEnabled Enabled DHCP packet relayed with the ALU-specific Option 82 string
