APC AP9630 User's Guide download pdf (Page 42)

40UPS Network Management Card 2 User’s Guide

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

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.

• Time Offset (option 2): The offset of the

NMC'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

NMC can use.

• Host Name (option 12): The host name that the

NMC will use (32-character maximum length).

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.

DHCPv6ModeforIPv6Configuration

Option Description

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 84 85

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