This section lists the DHCPv6 service options that can be configured in Address Manager.
|DHCPv6 Service Option||Description|
|Default Lease Time||Specifies the default lease time that will be offered to DHCP clients.|
|Client Updates||Indicates whether client updates should be used to maintain DDNS records for this client. When selected, the client updates its own DNS record on the server. When not selected, the DHCP server performs the update. This option is required for DHCP to perform DDNS updates.|
|DDNS Domain Name||Specifies the domain name appended to this client’s hostname to form the fully-qualified DNS name that will be dynamically updated by the DHCP server.|
|DDNS Host Name||Specifies the hostname that should be used in setting up the client’s
A and PTR records. If no value is specified, the server will creates a
host name automatically, using an algorithm that varies for the
different update methods.
|DDNS TTL||Specifies the default TTL for DDNS records, specified as an integer value from 0 to 4,294,967,295 seconds. The values can be set in seconds, minutes, hours or days.|
|DDNS Updates||Indicates whether the server should attempt a DDNS update when the lease is confirmed.|
|Update Conflict Detection||When enabled, the
server used in combination with DDNS updates to enforce ownership of a DNS name.
When this option is enabled and the DHCP server performs a DDNS update for the
client, an additional "guard" (either TXT or DHCID) record will be added to DNS to
record the DHCID of the client that owns this DNS entry. Other clients will not be
allowed to update or remove this DNS entry by DHCP, even if they have the same
hostname. This option is enabled by default.
Attention: You must only configure the Update Conflict Detection Service option at the configuration and server levels.
|Do Reverse Updates||Controls whether or not DHCP
performs reverse DNS updates for clients. When this option is not present, servers
perform reverse updates by default. Use this option when you want to disable
|DDNS Guard ID Must Match||Defines whether a
client ID within a DHCID resource record must match the client ID of a DNS update
to permit DNS entries associated to that DHCID resource record to be overwritten.
The default value is enabled.
|DDNS Other Guard Is Dynamic||Defines whether the
presence of a DHCID "guard" record that was produced using a different DDNS update
style allows a DNS entry to be overwritten. Enabling this option can result in
static entries being overwritten. The default value is disabled.
|DDNS Dual Stack Mixed Mode||Defines whether a
server operates in DSMM and whether DSMM rules are applied for DDNS conflict
resolution. The default value is disabled.
|DDNS Update Style||Defines the DDNS update style
to ensure that the type of guard record remains the same for a given protocol. Use
this option when you are configuring a Dual-Stack Mixed Mode (DSMM) environment.
The DHCP server offering IPv4 leases must have a different update style than the
DHCP server offering IPv6 leases. The default setting is interim.
|Server Preference||Informs a DHCPv6 client which server is preferred for use on a given subnet. This option is only applied during the initial stages of configuration. After a client bound to an IA, it will remain bound to that IA until it is no longer valid or has expired.|
|Preferred Lifetime||Specifies the length of preferred time before a valid address is deprecated.|
|Rapid Commit||Signals the use of the two message exchange for address assignment. Both DHCP server and client need to be configured to use this option.|
|Limit Addresses Per IA||Defines how many IPv6 addresses the DHCPv6 server will permit a specific client to hang onto at a time. The default setting is 1.|