User Manual

UPS Network Management Card 3 User Guide51
For DHCPv6 Mode, see the table below.
DHCP response options
Each valid DHCP response contains options that provide the TCP/IP settings that the NMC needs in order to
operate on a network. Each response also has other information that affects the operation of the NMC. See
also ID FA156110 at http://www.apc.com/site/support/index.cfm/faq/index.cfm.
Vendor Specific Information (option 43). The NMC uses this option in a DHCP response to determine
whether the DHCP response is valid. This option contains an option in a TAG/LEN/DATA format, called the
APC Cookie. This is disabled by default.
• APC Cookie. Tag 1, Len 4, Data “1APC”
Option 43 communicates to the NMC that a DHCP server is configured to service devices.
The following, in hexadecimal format, is an example of a Vendor Specific Information option that
contains the APC cookie:
Option 43 = 0x01 0x04 0x31 0x41 0x50 0x43
DHCPv6 Mode for IPv6 Configuration
Option Description
Router
Controlled
When this radio box is selected, DHCPv6 is controlled by the
M (Managed Address Configuration Flag) and O (Other Stateful Configuration Flag)
flags received in IPv6 Router Advertisements.
When a router advertisement is received, the NMC checks whether the M and O flags
are set. The NMC interprets them as follows:
• Neither is set: Indicates that the local network has no DHCPv6 infrastructure. The
NMC uses Router Advertisements and manual configuration to get non-link-local
addresses and other settings.
• M, or M and O are set: In this situation, full DHCPv6 address configuration occurs.
DHCPv6 is used to obtain addresses AND other configuration settings. This is
known as “DHCPv6 stateful”.
Once the M flag has been received, the DHCPv6 address configuration stays in
effect until the interface in question has been closed, even if subsequent Router
Advertisement packets are received in which the M flag is not set.
If an O flag is received first, then an M flag is received subsequently, the NMC
performs full address configuration upon receipt of the M flag.
• Only O is set: In this situation, the NMC sends a DHCPv6 Info-Request packet.
DHCPv6 is used to configure “other” settings (such as location of DNS servers), but
NOT to provide addresses. This is known as “DHCPv6 stateless”.
Address and
Other
Information
DHCPv6 is used to obtain addresses AND other configuration settings. This is known
as “DHCPv6 stateful”.
Non-Address
Information Only
DHCPv6 is used to configure “other” settings (such as location of DNS servers), but
NOT to provide addresses. This is known as “DHCPv6 stateless”.
Never DHCPv6 is NOT used for any configuration settings.