Netgear M4100-D12G-POE+ (GSM5212P) - ProSAFE Gigabit L2+ Managed Switch Administrator's Guide

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Security Management 
243
 ProSAFE M4100 Managed Switches
A screen similar to the following displays.
b.  For DHCP Snooping Mode, select the Enable radio button.
c.  Click Apply
2. 
Enable DHCP snooping in a VLAN. 
a. Select Security > Control > DHCP Snooping Global Configuration
A screen similar to the following displays. 
b.  In the VLAN ID field, enter 1
c.  In the DHCP Snooping Mode field, select Enable
A screen similar to the following displays.
3. 
Configure the port through which the DHCP server is reached as trusted. 
Here interface 1/0/1 is trusted.
a. Select Security > Control > DHCP Snooping Interface Configuration