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Assigned DNS Servers
The lease granted by a DHCPv6 server can contain up to three IPv6 addresses of DNSv6 servers.
However, NetDefendOS will only use the first and second of these which are sometimes known
as the Primary, and Secondary servers. If a third server is present in the lease it will be ignored.
The DNSv6 addresses obtained from the DHCP server will be stored in two properties of the
interface configuration object which are called DHCPv6DNS1 and DHCPv6DNS2.
Created DNS Address Objects
For the first DNSv6 server address in a lease, NetDefendOS will automatically create a new IPv6
address book object with the name <interface>_dns6_<num>, where <interface> is the interface
receiving the lease and <num> is the order number of the DNSv6 server in the lease.
For example, if the interface receiving the DHCPv6 lease is the wan interface then the address
book object created for the first lease will be named wan_dns6_1. If the lease contains a second
DNSv6 server address, this will be called wan_dns6_2 and so on.
The DNSv6 server addresses can be configured statically for NetDefendOS. If this is done, these
manually configured addresses take precedence over addresses received in a lease. However,
NetDefendOS will still automatically create the address book objects of the form
<interface>_dns6_<num> for each DHCPv6 server address received in the lease. This precedence
of statically defined DNS addresses is discussed further in Section 3.10, "DNS".
Behavior on Lease Expiry
When a DHCP lease ends and is not renewed, any address book objects created by the DHCPv6
mechanism will remain in the address book. However, the values of the address book objects
associated with an interface will be affected as follows:
•
Network and gateway objects will retain the values that were last allocated by DHCPv6.
•
All other objects will be set to the IPv6 unspecified address (::/128).
Example 5.6. DHCPv6 Client Setup
This example shows how to enable DHCPv6 on the wan interface. It is assumed that IPv6 has
already been enabled for the interface.
Command-Line Interface
gw-world:/> set Interface Ethernet wan DHCPv6Enabled=Yes
Web Interface
1.
Go to: Network > Interfaces and VPN > Ethernet
2.
Select the wan interface
3.
Select Enable DHCPv6 Client
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Chapter 5: DHCP Services
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Troubleshooting
