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packet. Likewise, if the IP address is fake, the address is not on the list of permissible addresses for the
port and the packet is dropped.
To enable IP source address validation, use the following command.
• Enable IP source address validation.
INTERFACE mode
ip dhcp source-address-validation
DHCP MAC Source Address Validation
DHCP MAC source address validation (SAV) validates a DHCP packet’s source hardware address against
the client hardware address field (CHADDR) in the payload.
The Dell Networking OS version 8.2.1.1 ensures that the packet’s source MAC address is checked against
the CHADDR field in the DHCP header only for packets from snooped VLANs.
• Enable DHCP MAC SAV.
CONFIGURATION mode
ip dhcp snooping verify mac-address
Enabling IP+MAC Source Address Validation
IP source address validation (SAV) validates the IP source address of an incoming packet against the
DHCP snooping binding table.
IP+MAC SAV ensures that the IP source address and MAC source address are a legitimate pair, rather than
validating each attribute individually. You cannot configure IP+MAC SAV with IP SAV.
1. Allocate at least one FP block to the ipmacacl CAM region.
CONFIGURATION mode
cam-acl l2acl
2. Save the running-config to the startup-config.
EXEC Privilege mode
copy running-config startup-config
3. Reload the system.
EXEC Privilege
reload
4. Enable IP+MAC SAV.
INTERFACE mode
ip dhcp source-address-validation ipmac
The system creates an ACL entry for each IP+MAC address pair in the binding table and applies it to the
interface.
To display the IP+MAC ACL for an interface for the entire system, use the show ip dhcp snooping
source-address-validation [interface] command in EXEC Privilege mode.
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Dynamic Host Configuration Protocol (DHCP)