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UPS Network Management Card 2 User’s Guide54
Administration: Network Features
TCP/IP and Communication Settings
TCP/IP settings for IPv4
Path: Administration > Network > TCP/IP > IPv4 settings
The TCP/IP option on the left navigation menu displays the current IPv4 address, subnet mask, default
gateway, MAC address, and boot mode of the UPS Network Management Card 2 (NMC).
For information on DHCP and DHCP options, see RFC2131 and RFC2132.
See the user interface online help for details on the options: Manual, BOOTP, DHCP.
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.
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
TCP/IP options. The NMC uses the following options within a valid DHCP response to define its TCP/IP
settings. All of these options except the first are described at 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
NMC.
• Subnet Mask (option 1): The Subnet Mask value that the
NMC needs to operate on the network.
• Router, i.e., Default Gateway (option 3): The default gateway address that the
NMC needs to operate
on the network.
• IP Address Lease Time (option 51): The time duration for the lease of the IP Address to the
NMC.
• Renewal Time, T1 (option 58): The time that the
NMC 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
NMC must wait after an IP address lease is assigned
before it can seek to rebind that lease.
Other options. The NMC 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
NMC can use.