Publication date: Sept, 2015
Revision A1
26
2-‐4.2 Snooping
DHCP Snooping is used to block intruders on the untrusted ports of the switch device when they try to
intervene by injecting a bogus DHCP reply packet to a legitimate conversation between the DHCP
client and server.
The section describes how to configure the DHCP Snooping parameters of the switch. The DHCP
Snooping can prevent attackers from adding their own DHCP servers to the network.
Web Interface
To configure DHCP snooping in the web interface:
1.
Click Configuration, DHCP, Snooping.
2.
Select “Enabled” in the DHCP Snooping Configuration mode.
3.
Select “Trusted” for the specific port in Port Mode Configuration.
4.
Click Apply.
Figure 2-‐4.2: The DHCP Snooping Configuration
Parameter description:
Snooping Mode:
Indicates the DHCP snooping mode operation. Possible modes are:
Enabled: Enable DHCP snooping mode operation. When DHCP snooping mode operation is enabled,
the DHCP request messages will be forwarded to trusted ports and only allow reply packets from
trusted ports.
Disabled: Disable DHCP snooping mode operation.
Port Mode Configuration
Indicates the DHCP snooping port mode. Possible port modes are:
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