Digi IX40 User Manual page 194

Interfaces
a. On the menu, click System. Under Configuration, click Device Configuration.
The Configuration window is displayed.
3. Click Network > Interfaces.
4. Click to expand an existing LAN, or create a new LAN. See
(LAN).
5. Click to expand IPv4 > DHCP server.
6. Enable the DHCP server.
7. (Optional) For Lease time, type the amount of time that a DHCP lease is valid.
Allowed values are any number of weeks, days, hours, minutes, or seconds, and take the
format number{w|d|h|m|s}.
For example, to set Lease time to ten minutes, enter 10m or 600s.
The default is 12 hours.
By default, DHCP leases are persistent across reboots. You can disable persistent leases:
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a. Click Network > Advanced.
b. Click to toggle off DHCP persistent leases.
8. (Optional) For Lease range start and Lease range end, type the lowest and highest 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 field.
Allowed values are between 1 and 254, and the default is 100 for Lease range start and 250
for Lease range end.
n Sequential DHCP address allocation:
By default, DHCP addresses are assigned psuedo-randomly, using a hash of the client's
MACaddress to determine the IP address that gets assigned. You can configure the
device to use sequential IP addresses instead:
a. Click Network > Advanced.
b. Click to enable Sequential DHCP address allocation.
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.
9. Optional DHCP server settings:
a. Click to expand Advanced settings.
b. For Gateway, select either:
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IX40 User Guide
None: No gateway is broadcast by the DHCP server. Client destinations must be
resolvable without a gateway.
Automatic: Broadcasts the IX40 device's gateway.
Custom: Allows you to identify the IP address of a Custom gateway to be
broadcast.
Local Area Networks (LANs)
Configure a Local Area Network
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