3Com 3031 Command Reference Manual page 427

Parameter
domain-name: Domain name that the DHCP server allocates to clients, which is a
string comprising at least three characters and at most 50 characters.
Description
Using the domain-name command, you can configure the domain name that a
global address pool of the DHCP server allocates to clients. Using the undo
domain-name command, you can delete the configured domain name.
By default, no domain name has been allocated to DHCP clients and domain name
is null.
For the related commands, see dhcp server ip-pool, dhcp server domain-name
interface, and dhcp server domain-name.
Example
Set the domain name of DHCP address pool 0 to mydomain.com.cn.
[3Com] dhcp server ip-pool 0
[3Com-dhcp-0] domain-name mydomain.com.cn
expired Syntax
expired { day day [ hour hour [ minute minute ] ] | unlimited }
undo expired
View
DHCP address pool view
Parameter
day day: Number of days in the range of 0 to 365.
hour hour: Number of hours in the range of 0 to 23.
minute minute: Number of hours in the range of 0 to 59.
unlimited: The valid period is unlimited.
Description
Using the expired command, you can configure a valid period allowed for leasing
IP addresses in a global DHCP address pool. Using the undo expired command,
you can restore the default setting.
By default, the leasing valid period is one day.
For the related commands, see dhcp server ip-pool, dhcp server expired, and dhcp
server expired interface.
Example
Set the IP address lease period of global address pool 0 to three minutes, two
hours, and one day.
[3Com] dhcp server ip-pool 0
[3Com-dhcp-0] expired 1 2 3
DHCP Server Configuration Commands 427