TCP/IP options: The Rack ATS uses the following options within a valid DHCP response to define its TCP/IP
settings. All of these options except the first are described in RFC2132.
• IP Address (from the yiaddr field of the DHCP response, described in RFC2131): The IP
address that the DHCP server is leasing to the Rack ATS.
• Subnet Mask (option 1): The Subnet Mask value that the Rack ATS needs to operate on the
network.
• Router, i.e., Default Gateway (option 3): The default gateway address that the Rack ATS needs to
operate on the network.
• IP Address Lease Time (option 51): The time duration for the lease of the IP Address to the Rack
ATS.
• Renewal Time, T1 (option 58): The time that the Rack ATS must wait after an IP address lease is
assigned before it can request a renewal of that lease.
• Rebinding Time, T2 (option 59): The time that the Rack ATS must wait after an IP address lease
is assigned before it can seek to rebind that lease.
Other options: The Rack ATS also uses these options within a valid DHCP response. All of these options
except the last are described in RFC2132.
• Network Time Protocol Servers (option 42): Up to two NTP servers (primary and secondary)
that the Rack ATS can use.
• Time Offset (option 2): The offset of the Rack ATS's subnet, in seconds, from Coordinated
Universal Time (UTC).
• Domain Name Server (option 6): Up to two Domain Name System (DNS) servers (primary and
secondary) that the Rack ATS can use.
• Host Name (option 12): The host name that the Rack ATS will use (32-character maximum
length).
• Domain Name (option 15): The domain name that the Rack ATS will use (64-character maximum
length).
• Boot File Name (from the file field of the DHCP response, described in RFC2131): The fully
qualified directory-path to a user configuration file (.ini file) to download. The siaddr field of the
DHCP response specifies the IP address of the server from which the Rack ATS will download
the .ini file. After the download, the .ini file is used as a boot file to reconfigure the settings.
Path: Configuration > Network > TCP/IP > IPv6 settings
Setting Description
IPv6 Enable or disable IPv6 with this check box.
Manual
Configuration
Configure IPv6 manually by entering the IP address and the default gateway.
Auto
Configuration
When the Auto Configuration check box is selected, the system obtains addressing prefixes
from the router (if available). It uses those prefixes to automatically configure IPv6 addresses.
DHCPv6 Mode Router Controlled: Selecting this option means that DHCPv6 is controlled by the Managed (M)
and Other (O) flags received in IPv6 router advertisements. When a router advertisement is
received, the ATS checks whether the M or the O flag is set. The NMC interprets the state of the
M (Managed Address Configuration Flag) and O (Other Stateful Configuration Flag) "bits" for the
following cases:
• Neither is set: Indicates the local network has no DHCPv6 infrastructure. The ATS uses router
advertisements and manual configuration to get addresses that are not link-local and other
settings.
