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 detail s 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 af ter an I P addres s lease is assi gned
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 se condar y) that the
NMC can use.