Lantronix SISPM1040-xxxx-L3 Web User Guide
33856 Rev. A https://www.lantronix.com/ 474
Appendix A – DHCP Per Port Configuration
You can configure DHCP Per Port via the Web UI as described below.
DHCP IP per Port
This function lets you assign a static IP address from a DHCP pool to a switch port such that it will always be
assigned that specific IP address.
The IP address would be configured in the Interface Config settings.
Note that this is binding an IP address to an interface, not to a MAC address (the typical binding method used on
this and most other switches).
Configure DHCP Per Port via the Web UI
The switch’s DHCP server assigns IP addresses. Clients get IP addresses in sequence and the switch assigns IP addresses on a
per-port basis starting from the configured IP range. For example, if the IP address range is configured as 192.168.10.20 -
192.168.10.37 with one DHCP device connected to port 1, the client will always get IP address 192.168.10.20, then port 3 is
always distributed IP address 192.168.10.22, even if port 2 is an empty port (because port 2 is always distributed IP address
192.168.10.21).
The switch does not allow a DHCP per Port pool to include the switch’s address.
IP address assigned range and VLAN 1 should stay in the same subnet mask.
The configurable IP address range is allowed to configure over 18 IP addresses, but the switch always assigns one IP address
per port connecting device.
The DHCP Per Port function is only supported on VLAN 1.
When the DHCP Per Port function is enabled, the switch software will automatically create the related DHCP pool named
“DHCP_Per _Port”.
Once the DHCP Per Port function is enabled on one switch, IPv4 DHCP client at VLAN1 mode (DMS DHCP mode), DHCP
server mode are all limited to be enabled at the same time (an error message displays if attempted).
If the DHCP server pool has been configured, once you enable the DHCP Per Port function, then that DHCP server pool
configuration will be overwritten.
Only for VLAN 1, clients issued DHCP packets will not be broadcast/forwarded to other ports. DHCP packets in others VLANs
will be broadcast/forwarded to other ports.
The DHCP Per Port function allows the switch to connect only one DHCP client device.
DHCP-Per-Port is configured entirely on the Switch > Configuration > System > IP page, IP Interfaces window.
The feature is enabled here and an IP range (pool) is entered. The “automatic” results of this action can be displayed in:
• Switch > Configuration > System > DHCP > Server > Mode (Global Mode – Enabled, VLAN Mode - VLAN 1 created)
• Switch > Configuration > System > DHCP > Excluded (Excluded range created based on range entered)
• Switch > Configuration > System > DHCP > Pool (Pool “DHCP_Per_Port” created based on range entered)
Actual DHCP operation is monitored as normal under System > Monitor > DHCP.
The DHCP Per Port pages and parameters are described below.
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