User`s guide
39UPS Network Management Card 2 User’s Guide
TCP/IP settings for IPv6 screen
Path: Configuration > Network > TCP/IP > IPv6 Settings
This option displays any current IPv6 settings of the UPS Network Management Card 2 (NMC). Use the lower
part of the screen to configure those settings, including disabling IPv6.
You have a choice of using manual or automated IP addressing. It is possible to use them both concurrently.
For Manual, select the check box and then enter the System IP v6 address and the Default Gateway.
Select the Auto Configuration check box to enable the system to obtain addressing prefixes from the router (if
available). It will use those prefixes to automatically configure IPv6 addresses.
For DHCPv6 Mode, see the table below.
IPv6PossibleFormats Description
fe80:0000:0000:0000:0204:61ff:fe9d:f156 full form of IPv6
fe80:0:0:0:204:61ff:fe9d:f156 drop leading zeroes
fe80::204:61ff:fe9d:f156 collapse multiple zeroes to :: in the IPv6 address
fe80:0000:0000:0000:0204:61ff:254.157.241.86 IPv4 dotted quad at the end
fe80:0:0:0:0204:61ff:254.157.241.86 drop leading zeroes, IPv4 dotted quad at the end
fe80::204:61ff:254.157.241.86 dotted quad at the end, multiple zeroes collapsed
::1 localhost
fe80:: link-local prefix
2001:: global unicast prefix
DHCPv6ModeforIPv6Configuration
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”.