DHCP/4/DHCP_RELAY_WRONG_MAC

Message

DHCP/4/DHCP_RELAY_WRONG_MAC: DHCP relay receive a dhcp packet with wrong 'chaddr'. (CHADDR=[STRING1], MAC type=[STRING2], InterfaceName=[STRING3]).

Description

The DHCP relay receives a DHCP packet with the incorrect client MAC address.

Parameters

Parameter Name	Parameter Meaning
CHADDR	MAC address of the DHCP client.
MAC type	MAC address type of the DHCP client. broadcast multicast
InterfaceName	Name of the interface configured with the DHCP relay function.

Possible Causes

The DHCP relay receives a DHCP packet in which the client MAC address field is set to a broadcast or unicast address. To prevent attacks, the device considers this packet as an invalid packet.

Procedure

Check whether there are DHCP attacks based on the client MAC address and the name of the interface that receives the packet.
- Y=>2.
- N=>3.
Configure DHCP snooping to check validity of DHCP packets.
End.