Dell Force10 E600i FTOS Version 8.4.1.5 Configuration Guide for ExaScale - Page 323
IP Source Address Validation, DHCP MAC Source Address Validation, IP+MAC Source Address Validation
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IP Source Address Validation IP Source Address Validation (SAV) prevents IP spoofing by forwarding only IP packets that have been validated against the DHCP binding table. A spoofed IP packet is one in which the IP source address is strategically chosen to disguise the attacker. For example, using ARP spoofing an attacker can assume a legitimate client's identity and receive traffic addressed to it. Then the attacker can spoof the client's IP address to interact with other clients. The DHCP binding table associates addresses assigned by the DHCP servers, with the port on which the requesting client is attached. When IP Source Address Validation is enabled on a port, the system verifies that the source IP address is one that is associated with the incoming port. If an attacker is impostering as a legitimate client the source address appears on the wrong ingress port, and the system drops the packet. Likewise, if the IP address is fake, the address will not be on the list of permissible addresses for the port, and the packet is dropped. Task Enable IP Source Address Validation Command Syntax ip dhcp source-address-validation Command Mode INTERFACE 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. FTOS Release 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. Task Enable DHCP MAC Source Address Validation. Command Syntax ip dhcp snooping verify mac-address Command Mode CONFIGURATION IP+MAC Source Address Validation c s IP+MAC Source Address Validation is available on platforms: IP Source Address Validation validates the IP source address of an incoming packet against the DHCP Snooping binding table. IP+MAC Source Address Validation ensures that the IP source address and MAC source address are a legitimate pair, rather validating each attribute individually. IP+MAC Source Address Validation cannot be configured with IP Source Address Validation. Step 1 2 3 4 Task Allocate at least one FP block to the ipmacacl CAM region. Save the running-config to the startup-config. Reload the system. Enable IP+MAC Source Address Validation. Command Syntax cam-acl l2acl Command Mode CONFIGURATION copy running-config startup-config reload ip dhcp source-address-validation ipmac EXEC Privilege EXEC Privilege INTERFACE Dynamic Host Configuration Protocol | 323
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