DHCP Pools

Last Updated : Jun 19, 2024 |

Navigation: System > LAN > DHCP Pools

You can use DHCP pools to configure multiple sets of IPv4 addresses that the IP Office can allocate when configured as a DHCP server.

  • IP Office Manager displays these settings when you have enabled Advanced on the System > LAN1 > Settings tab.

  • On an IP500 V2 system, you can configure up to 8 pools.

  • On Linux-based IP Office systems, you can configure up to 64 pools.

  • The IP Office uses the IP Address, IP Mask and Number of DHCP IP Addresses settings set on the LAN Settings tab for the first pool.

These settings are mergeable. However, the following actions require a merge with service disruption:

  • Changing the Start Address, Subnet Mask or Default Router value for an existing DHCP Pool of addresses.

  • Decreasing the Pool Size for an existing pool of addresses.

  • Deleting an existing pool of addresses.

When these actions are performed:

  • For E129 and B179 SIP phone models, the IP Office triggers a reboot of the phones to renew their IP address lease and apply the new address settings.

  • For the remaining DHCP clients, you must manually reboot the devices to force an IP addresses lease renewal. Otherwise, the devices continue to use the allocated IP addresses until the IP addresses lease time out expires. IP address lease time out is set to three days.

Field

Description

Apply to Avaya IP Phones Only

Default = Off.

When enabled, the IP Office only responds to DHCP requests from Avaya IP phones. Other devices must use static addresses or obtain their address from another DHCP server.

  • In addition, Avaya IP phones will complete DHCP only with a DHCP server configured to support the same Site Specific Option Number (SSON) as set on the phone. For IP Office, the SSON numbers it supports are set on the System > LAN1 > VoIP and System > LAN2 > VoIP sub-tabs.

  • After changing this setting, you must reboot DHCP client devices to force IP addresses updates.

DHCP Pool

When adding or editing pools, the options are:

Setting

Description

Start Address

Default = Blank

Sets the first IP address in the pool.

Subnet Mask

Default = 255.255.255.0

Sets the subnet mask for addresses issued from the pool.

Default Router

Default = 0.0.0.0

The default router address to include in the DHCP response.

  • For pools issuing IP addresses on the same subnet as the IP Office LAN, entering 0.0.0.0 instructs the IP Office to issue the default router as being the Destination of the IP Route entry that matches the IP address and subnet mask.

  • For pools issuing addresses for a different subnet from the IP Office LAN, you must set the default router to the correct value for devices on that subnet.

Pool Size

Default = 0

Set the number of client IP addresses available in the pool.

The first pool matches the IP Address, IP Mask and Number of DHCP IP Addresses on the LAN Settings sub-tab.
Related information
LAN1