Kontron AT8404 CLI - Manual (Page 259)

AT8404 Utility Commands
Page 4 - 45 AT8404 CLI Reference Manual
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4.8.28 show ip dhcp conflict
This command displays address conflicts logged by the DHCP Server. If no IP address is specified, all the conflicting
addresses are displayed.
4.9 DHCP Filtering
You can configure the DHCP Filtering feature as a security measure against unauthorized DHCP servers. DHCP
filtering works by allowing you to configure each port as either a trusted port or an untrusted port. To optimize the
DHCP filtering feature, configure the port that is connected to an authorized DHCP server on your network as a
trusted port. Any DHCP responses received on a trusted port are forwarded. Make sure that all other ports are
untrusted so that any DHCP (or BootP) responses received are discarded.
You can configure DHCP filtering on physical ports and LAGs. DHCP filtering is not operable on VLAN interfaces.
4.9.1 ip dhcp filtering
This command enables DHCP filtering globally.
4.9.1.1 no ip dhcp filtering
This command disables DHCP filtering.
Message Definition
DHCP OFFER The number of DHCPOFFER messages the server sent.
DHCP ACK The number of DHCPACK messages the server sent.
DHCP NACK The number of DHCPNACK messages the server sent.
Format show ip dhcp conflict []
Modes • Privileged EXEC
• User EXEC
Term Definition
IP address The IP address of the host as recorded on the DHCP server.
Detection Method The manner in which the IP address of the hosts were found on the DHCP Server .
Detection time The time when the conflict was found.
Default disabled
Format ip dhcp filtering
Mode Global Config
Format no ip dhcp filtering
Mode Global Config