Dhcp Server Options - Alcatel-Lucent 7705 Configuration Manual

When a DHCP server receives a DHCP message from a DHCP Relay agent, the server looks
for a subnet to use for assigning an IP address. If configured with the use-pool-from-
client command, the server searches Option 82 information for a pool name. If a pool
name is found, an available address from any subnet of the pool is offered to the client. If
configured with the use-gi-address command, the server uses the gateway IP address
(GIADDR) supplied by the relay agent to find a matching subnet. If a subnet is found, an
address from the subnet is offered to the client. If no pool or subnet is found, then no IP
address is offered to the client.
IPv4 address assignments are temporary and expire when the configured lease time is up. The
server can reassign addresses after the lease expires.
If both the no use-pool-from-client command and the no use-gi-address
command are specified, the server does not act.

DHCP Server Options

Options and identification strings can be configured on several levels. DHCP servers support
the following options, as defined in RFC 2132:
DHCP servers also support Suboption 13 Relay Agent Information Option 82 as specified in
RFC 3046, to enable the use of a pool indicated by the DHCP client.
7705 SAR OS Router Configuration Guide
• Option 1—Subnet Mask
• Option 3—Default Routers
• Option 6—DNS Name Servers
• Option 12—Host Name
• Option 15—Domain Name
• Option 44—Netbios Name Server
• Option 46—Netbios Node Type Option
• Option 50—IP Address
• Option 51—IP Address Lease Time
• Option 53—DHCP Message Type
• Option 54—DHCP Server IP Address
• Option 55—Parameter Request List
• Option 58—Renew (T1) Timer
• Option 59—Renew (T2) Timer
IP Router Configuration
35