LevelOne GEL-1061, User Manual

Page: 304 / 500

Chapter 12
| Security Measures
DHCP Snooping
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Parameters
These parameters are displayed:
◆
VLAN – ID of a configured VLAN. (Range: 1-4094)
◆
DHCP Snooping Status – Enables or disables DHCP snooping for the selected
VLAN. When DHCP snooping is enabled globally on the switch, and enabled on
the specified VLAN, DHCP packet filtering will be performed on any untrusted
ports within the VLAN. (Default: Disabled)
Web Interface
To configure global settings for DHCP Snooping:
1.
Click Security, DHCP Snooping.
2.
Select Configure VLAN from the Step list.
3.
Enable DHCP Snooping on any existing VLAN.
4.
Click Apply
Figure 192: Configuring DHCP Snooping on a VLAN
Configuring Ports
for DHCP Snooping
Use the Security > DHCP Snooping (Configure Interface) page to configure switch
ports as trusted or untrusted.
Command Usage
◆
A trusted interface is an interface that is configured to receive only messages
from within the network. An untrusted interface is an interface that is
configured to receive messages from outside the network or fire wall.
◆
When DHCP snooping is enabled both globally and on a VLAN, DHCP packet
filtering will be performed on any untrusted ports within the VLAN.
◆
When an untrusted port is changed to a trusted port, all the dynamic DHCP
snooping bindings associated with this port are removed.
◆
Set all ports connected to DHCP servers within the local network or fire wall to
trusted state. Set all other ports outside the local network or fire wall to
untrusted state.