Lantronix
SM12XPA Web User Guide
33848 Rev. A
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10. DHCP
This section lets you set and view DHCP snooping, SNMP relay, and SNMP server parameters.
Snooping
Configuration
DHCP Snooping is used to block an intruder on the untrusted ports of the switch device when it tries to
intervene by injecting a bogus DHCP reply packet to a legitimate conversation between the DHCP client and
server.
This page lets you configure DHCP Snooping parameters of the switch. DHCP Snooping can prevent attackers
from adding their own DHCP servers to the network.
Web Interface
To configure DHCP snooping in the web UI:
1.
Click DHCP, Snooping, and Configuration.
2.
At Snooping Mode select “on” to enable snooping globally.
3.
At the Mode dropdown Select “Trusted” for the desired ports.
4.
Click Apply.
Figure 10-1.1: DHCP Snooping Configuration
Parameter descriptions
:
Snooping Mode
: Indicates the DHCP snooping mode operation. Possible modes are:
on
: 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.
off
: Disable DHCP snooping mode operation (default).
Port Mode Configuration
: Indicates the DHCP snooping port mode. Possible port modes are:
Trusted
: Configures the port as trusted source of the DHCP messages. Trusted port can forward DHCP
packets normally.
Untrusted
: Configures the port as untrusted source of the DHCP messages. Untrusted port will discard
the packets when it receives DHCP packets.