Settings (IPv6)

Last Updated : Aug 30, 2026 |
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Resource Id: sys_settings202403
You can use these settings to configure IPv6 address support on the LAN.
  • The IP Office licensing and configuration requirements for remote extensions are the same for IPv6 as for IPv4. The IP Office treats any extension using an IPv6 global unicast address not issued by IP Office DHCP as a remote extension.

Configuration Settings

You must edit these settings offline. Select Menu Bar Current User IconOffline Mode.
Field
Description
IPv6
Default = Disabled
IP Office supports IPv6 on Linux-based IP Office systems only. When enabled, the IP Office system supports IPv6 features on the LAN.
  • If using the IP Office self-signed certificates, you must regenerate the self-signed IP Office certificates after enabling IPv6 support.
  • You can also configure the IP Office system IPv6 address settings through the server Platform View/Web Control menus.
  • Avaya supports IPv6 on IP Office LAN1. Avaya also supports IPv6 on LAN2 but only when IPv6 is enabled on LAN1 also.
IP Address
Default = Blank
Sets or shows the IP Office IPv6 address on the LAN.
  • You cannot change the address if the IP Office is a DHCPv6 client.
  • You cannot change the address if the IP Office is using Stateless Address Auto-configuration (SLAAC).
  • If setting a static address, the IP Office supports /64 subnet prefixes only.
    • The IP Office supports IPv6 addresses in the following formats:
      • Full address: For example, 2001:0000:040F:0000:0000:0000:805B:001B.
      • Replace one series of :0000: parts with ::. For example, 2001:0000:040F::805B:001B.
      • Replace any individual :0000: parts with :0:. For example, 2001:0:040F::805B:001B.
      • Remove leading 0 zeros after any : colon. For example, 2001:0:40F::805B:1B.
Gateway
Display = Blank
Displays the default gateway settings for routing. If not using DHCP, you can edit the field to change the setting.
Stateless Address Auto-configuration (SLAAC)
Default = Disabled
If enabled:
  • The IP Office uses SLAAC (RFC4862) to set an IPv6 unicast address for the LAN, and to obtain details of the network IPv6 routers.
  • IP Office Manager disables all other settings on the tab.
  • Avaya assumes that dynamically addressed devices on the LAN use SLAAC for their IPv6 addresses.
Number of DHCP IP Addresses
Default = 24. Range = 1 to 500.
This defines the number of sequential IP addresses available for DHCP clients.
DHCP Mode
Default = DHCP Client.
Set the IP Office IPv6 DHCP mode for the LAN. The options are:
Option
Description
Server Stateful
In response a DHCPv6 request, the IP Office issues information such as domain name, DNS server address, and file server address. This includes issuing an IPv6 address.
  • The IP Office maintains details of the IPv6 addresses it has issued.
Server Stateless
In response to a DHCPv6 request, the IP Office issues information such as domain name, DNS server address, and file server address. However:
  • The IP Office does not issue an IPv6 IP address.
  • The IP Office expects other dynamically-addressed devices on the LAN to obtain their IPv6 address using mechanisms such as SLAAC.
Client
The IP Office system request IPv6 address information from a DHCPv6 server on the LAN.
Disabled
The IP Office system is not a DHCPv6 client or server.
Advanced
Default = Disabled.
When functioning as a DHCP server, you can configure the IP Office with multiple address pools from which it can issue IPv6 addresses.
  • When enabled, IP Office Web Manager displays the DHCP Pools (IPv6) settings below.

DHCP Pools (IPv6)

You can use DHCP pools to configure multiple sets of IPv4 addresses that the IP Office can allocate when configured as a stateful DHCPv6 server.
  • IP Office Web Manager displays these settings when you have enabled Advanced above.
  • Supported on Linux-based IP Office R12.1 systems only. To enable IPv6 support, select LAN1LAN Setting (IPv6)IPv6 and/or LAN2LAN Setting (IPv6)IPv6.
  • You can configure up to 64 pools.
  • The IP Office uses the IP Address and Number of DHCP IP Addresses settings set on the LAN Setting (IPv6) tab for the first pool.
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 SystemLAN1VoIP and SystemLAN2VoIP sub-tabs.
  • After changing this setting, you must reboot DHCP client devices to force IP addresses updates.
DNS Server (IPv6)
Default = :: (Do not use)
The IPv6 address of the DNS server. If the IP Office system is acting as a DHCP server, in addition to providing clients with their IP address settings, it can also provide them with DNS if requested by the client.
  • If left at the default, the IP Office system uses its own LAN address as the DNS server for DHCP clients.
  • The IP Office does not support DNS priority. If the DNS response contains multiple addresses with priority, the IP Office only uses the first address.
Backup DNS Server (IPv6)
Default = :: (Do not use)
The alternate IPv6 DNS server address clients can use if the server address above does not respond.
DHCP Pool
The first pool matches the IP Address and Number of DHCP IP Addresses on the LAN Setting (IPv6) sub-tab. When adding or editing pools, the options are:
Setting
Description
Start Address
Default = Blank
Sets the first IP address in the pool.
  • The IP Office supports IPv6 addresses in the following formats:
    • Full address: For example, 2001:0000:040F:0000:0000:0000:805B:001B.
    • Replace one series of :0000: parts with ::. For example, 2001:0000:040F::805B:001B.
    • Replace any individual :0000: parts with :0:. For example, 2001:0:040F::805B:001B.
    • Remove leading 0 zeros after any : colon. For example, 2001:0:40F::805B:1B.
Pool Size
Default = 0, Range = 1 to 500
Set the number of client IP addresses available in the pool.
Related links
LAN1