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840 | DHCPwithVendor-SpecificOptions DellPowerConnectW-SeriesArubaOS6.2 | User Guide
Enabling DHCP Relay Agent Information Option (Option 82)
The DHCP Relay Agent Information option (Option 82) allows the DHCP Relay Agent to insert circuit specific
information into a request that is being forwarded to a DHCP server.
The controller, when acting as a DHCP relay agent, inserts information about the AP and SSID through which a
client is connecting into the DHCP request. Many service providers use this mechanism to make access control
decisions.
Configuring Option 82
You can configure Option 82 using the WebUI or the CLI. You can include only the MAC address or MAC address
and ESSID. The MAC address is the hardware address and ESSID is an alphanumeric name that uniquely identifies
a wireless network.
In the WebUI
1. Navigate to Configuration > Network > IP > IP Interfaces.
2. Click Edit next to the VLAN ID for which you want to configure Option 82.
3. Under DHCP Helper Address select Mac or Mac Essid from the Option-82 drop-down menu.
4. Click Apply.
In the CLI
This example enables Option 82 for VLAN 5 using ESSID. You can include only the MAC address or MAC address
and ESSID.
(host) (config) #interface vlan 5
(host) (config-subif)#option-82
(host) (config-subif)#option-82 mac essid
(host) (config-subif)#
Enabling Linux DHCP Servers
The following is an example configuration for the Linux dhcpd.conf file. After you enter the configuration, you must
restart the DHCP service.
option serverip code 43 = ip-address;
class "vendor-class" {
match option vendor-class-identifier;
}
.
.
.
subnet 10.200.10.0 netmask 255.255.255.0 {
default-lease-time 200;
max-lease-time 200;
option subnet-mask 255.255.255.0;
option routers 10.200.10.1;
option domain-name-servers 10.4.0.12;
option domain-name "vlan10.aa.mycorpnetworks.com";
subclass "vendor-class" "ArubaAP" {
option vendor-class-identifier "ArubaAP";
#
# option serverip <loopback-IP-address-of-master-controller>
#
option serverip 10.200.10.10;
}