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Chapter 12
| Security Measures
DHCP Snooping
◆
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.
Parameters
These parameters are displayed:
◆
Trust Status – Enables or disables a port as trusted. (Default: Disabled)
◆
Circuit ID – Specifies DHCP Option 82 circuit ID suboption information.
Mode – Specifies the default string "VLAN-Unit-Port" or an arbitrary string.
■
(Default: VLAN-Unit-Port)
Value – An arbitrary string inserted into the circuit identifier field.
■
(Range: 1-32 characters)
Web Interface
To configure global settings for DHCP Snooping:
1.
Click IP Service, DHCP, Snooping.
2.
Select Configure Interface from the Step list.
3.
Set any ports within the local network or firewall to trusted.
4.
Click Apply
Figure 219: Configuring the Port Mode for DHCP Snooping
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