Configuring The Default Dhcp Scope For Client Ip Assignment; Dhcp Relay And Option 82 - Aruba IAP-335 User Manual

The following table describes the behavior of the DHCP Relay Agent and Option 82 in the IAP.
Table 46: DHCP Relay and Option 82
DHCP Relay
Enabled
Enabled
Disabled
Disabled
In the CLI
To configure a Centralized, L2 DHCP profile:
(Instant AP)(config)# ip dhcp <profile-name>
(Instant AP)(DHCP Profile <profile-name>)# server-type <centralized>
(Instant AP)(DHCP Profile <profile-name>)# server-vlan <vlan-ID>
(Instant AP)(DHCP Profile <profile-name>)# option82 alu
(Instant AP)(DHCP Profile <profile-name>)# disable-split-tunnel
(Instant AP)(DHCP Profile <profile-name>)# end
(Instant AP)# commit apply
To configure a Centralized, L3 DHCP profile:
(Instant AP)(config)# ip dhcp <profile-name>
(Instant AP)(DHCP Profile <profile-name>)# server-type <centralized>
(Instant AP)(DHCP Profile <profile-name>)# server-vlan <vlan-ID>
(Instant AP)(DHCP Profile <profile-name>)# dhcp-relay
(Instant AP)(DHCP Profile <profile-name>)# dhcp-server <DHCP-relay-server>
(Instant AP)(DHCP Profile <profile-name>)# vlan-ip <DHCP IP address> mask <VLAN mask>
(Instant AP)(DHCP Profile <profile-name>)# end
(Instant AP)# commit apply

Configuring the Default DHCP Scope for Client IP Assignment

The DHCP server is a built-in server, used for networks in which clients are assigned IP address by the VC. You
can customize the DHCP pool subnet and address range to provide simultaneous access to more number of
clients. The largest address pool supported is 2048. The default size of the IP address pool is 512.
When a DHCP server is configured and if the Client IP assignment parameter for an SSID profile is set to
Virtual Controller Assigned, the VC assigns the IP addresses to the WLAN or the wired clients. By default,
the IAP automatically determines a suitable DHCP pool for Virtual Controller Assigned networks.
IAPs typically select the 172.31.98.0/23 subnet. If the IP address of the IAP is within the 172.31.98.0/23
subnet, the IAP selects the 10.254.98.0/23 subnet. However, this mechanism does not guarantee that it
would avoid all possible conflicts with the wired network. If your wired network uses either 172.31.98.0/23
or 10.254.98.0/23, and you experience problems with the Virtual Controller Assigned networks after
upgrading to Aruba Instant 6.2.1.0-3.4.0.0 or later, manually configure the DHCP pool by following the steps
described in this section.
You can configure a domain name, DNS server, and DHCP server for client IP assignment using the Instant UI
or the CLI.
218 | DHCP Configuration
Option
Result
82
Enabled DHCP packet relayed with the ALU-specific Option 82 string
Disabled DHCP packet relayed without the ALU-specific Option 82 string
Enabled DHCP packet not relayed, but broadcast with the ALU-specific Option 82 string
Disabled DHCP packet not relayed, but broadcast without the ALU-specific Option 82
string
Aruba Instant 6.5.0.0-4.3.0.0 | User Guide