Digi IX40 User Manual page 196

Interfaces
4. (Optional) Set the amount of time that a DHCP lease is valid:
(config)> network interface my_lan ipv4 dhcp_server lease_time value
(config)>
where value is any number of weeks, days, hours, minutes, or seconds, and takes the format
number{w|d|h|m|s}.
For example, to set network interface my_lan ipv4 dhcp_server lease_time to ten minutes,
enter either 10m or 600s:
(config)> network interface my_lan ipv4 dhcp_server lease_time 600s
(config)>
n By default, DHCP leases are persistent across reboots. You can disable persistent leases:
(config)> network advanced dhcp_persistent_lease false
(config)>
5. (Optional) Set the lowest IP address that the DHCP server will assign to a client. This value
represents the low order byte of the address (the final triplet in an IPv4 address, for example,
192.168.2.xxx). The remainder of the IP address will be based on the LAN's static IP address as
defined in the address parameter.
(config)> network interface my_lan ipv4 dhcp_server lease_start num
(config)>
Allowed values are between 1 and 254, and the default is 100.
6. (Optional) Set the highest IP address that the DHCP server will assign to a client:
(config)> network interface my_lan ipv4 dhcp_server lease_end num
(config)>
Allowed values are between 1 and 254, and the default is 250.
7. Sequential DHCP address allocation
By default, DHCP addresses are assigned psuedo-randomly, using a hash of the client's MAC
address to determine the IP address that gets assigned. You can configure the device to use
sequential IP addresses instead:
(config)> network advanced sequential_dhcp_allocation true
(config)>
Because sequential mode does not use a hash based on the client's MAC address, when DHCP
lease expires, the client is not likely to get the same IP address assigned to it. Therefore,
sentential DHCP address allocation generally should not be used.
8. Optional DHCP server settings:
a. Click to expand Advanced settings.
b. Determine how the DHCP server should broadcast the gateway server:
(config)> network interface my_lan ipv4 dhcp_server advanced gateway value
(config)>
IX40 User Guide
Local Area Networks (LANs)
196