Kontron AT890X Full-Size CLI - Manual (Page 240)

Utility Commands AT8901/2/3
AT8901/2/3 CLI Reference Manual Page 5 - 42
DHCP RELEASE The number of DHCPRELEASE messages the server has
received.
DHCP INFORM The number of DHCPINFORM messages the server has received.
Message Sent:
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.
5.9.28 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.
Format
show ip dhcp conflict []
Modes Privileged EXEC
User EXEC
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.
5.10 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.
5.10.1 ip dhcp filtering
This command enables DHCP filtering globally.
Default disabled
Format ip dhcp filtering
Mode Global Config
5.10.1.1 no ip dhcp filtering
This command disables DHCP filtering.
Format
no ip dhcp filtering
Mode Global Config