D-Link DWS-3160-24TC [271/505] Dhcp relay

DWS-3160 Series Gigabit Ethernet Unified Switch Web UI Reference Guide

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Chapter 8 Network Application

DHCP

SNTP

Flash File System Settings

DHCP

DHCP Relay

DHCP Relay Global Settings

This window is used to enable and configure DHCP Relay Global Settings. The relay hops count limit allows the

maximum number of hops (routers) that the DHCP messages can be relayed through to be set. If a packet’s hop

count is more than the hop count limit, the packet is dropped. The range is between 1 and 16 hops, with a default

value of 4. The relay time threshold sets the minimum time (in seconds) that the Switch will wait before forwarding

a BOOTREQUEST packet. If the value in the seconds’ field of the packet is less than the relay time threshold, the

packet will be dropped. The range is between 0 and 65,535 seconds, with a default value of 0 seconds.

To view this window, click Network Application > DHCP > DHCP Relay > DHCP Relay Global Settings as

shown below:

Figure 12-1 DHCP Relay Global Settings window

The fields that can be configured are described below:

Parameter Description

DHCP Relay State

Use the drop-down menu to enable or disable the DHCP Relay service on the

Switch. The default is Disabled.

DHCP Relay Hops

Count Limit (1-16)

Enter an entry between 1 and 16 to define the maximum number of router hops

DHCP messages can be forwarded. The default hop count is 4.

DHCP Relay Time

Threshold (0-65535)

Enter an entry between 0 and 65535 seconds, and defines the maximum time limit

for routing a DHCP packet. If a value of 0 is entered, the Switch will not process the

value in the seconds’ field of the DHCP packet. If a non-zero value is entered, the

Switch will use that value, along with the hop count to determine whether to forward

a given DHCP packet.

DHCP Relay Option 82

State

Use the drop-down menu to enable or disable the DHCP Relay Agent Information

Option 82 on the Switch. The default is Disabled.

Enabled –When this field is toggled to Enabled, the relay agent will insert and

remove DHCP relay information (option 82 field) in messages between DHCP

servers and clients. When the relay agent receives the DHCP request, it adds the

option 82 information, and the IP address of the relay agent (if the relay agent is