Lantronix SISPM1040-3166-L Web User Guide Rev G PDF 14.13 MB - Page 236
Interface, DHCP Relay Configuration, Parameter, descriptions, Relay, Server,
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Transition Networks SISPM1040-3xxx-L Web User Guide 14-2 Relay 14-2.1 Configuration A DHCP relay agent is used to forward and to transfer DHCP messages between the clients and the server when they are not in the same subnet domain. It stores the incoming interface IP address in the GIADDR field of the DHCP packet. The DHCP server can use the value of GIADDR field to determine the assigned subnet. For such a condition, please make sure the switch configuration of VLAN interface IP address and PVID (Port VLAN ID) correctly. Web Interface To configure DHCP Relay in the web interface: 1. Click DHCP, Relay and Configuration. 2. Specify the Relay Mode, Relay server, Relay Information Mode, Relay Information Policy. 3. Click Apply. Figure 14-2.1: DHCP Relay Configuration Parameter descriptions: Relay Mode : Indicates the DHCP relay mode operation. Possible modes are: on: Enable DHCP relay mode operation. When DHCP relay mode operation is enabled, the agent forwards and transfers DHCP messages between the clients and the server when they are not in the same subnet domain. And the DHCP broadcast message won't be flooded for security considerations. off: Disable DHCP relay mode operation. Relay Server : Indicates the DHCP relay server IP address. Relay Information Mode : Indicates the DHCP relay information mode option operation. The option 82 circuit ID format as "[vlan_id][module_id][port_no]". The first four characters represent the VLAN ID, the fifth and sixth characters are the module ID(in standalone device it always equals 0, in stackable device it means switch ID), and the last two characters are the port number. For example, "00030108" means the DHCP message receive form VLAN ID 3, switch ID 1, port No 8. And the option 82 remote ID value is equal the switch MAC address. Possible modes are: 33763 Rev. G https://www.transition.com Page 236 of 496