D-Link DGS-3630-28SC Emulator 1 - Page 1589
ip verify unicast source
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DGS-3630 Layer 3 Stackable Managed Switch CLI Reference Guide 129-2 ip verify unicast source This command is used to configure URPF on interfaces. Use the no form of this command to disable URPF checking on an interface or to revert to the default settings ip verify unicast source [reachable-via {any | rx}] [allow-default] [access-group IP-ACCESS-LIST-NAME] [ipv6-access-group IPV6-ACCESS-LIST-NAME] no ip verify unicast source [reachable-via] [allow-default] [access-group] [ipv6-access-group] Parameters reachable-via any rx allow-default access-group IP-ACCESSLIST-NAME ipv6-access-group IPV6ACCESS-LIST-NAME (Optional) Specifies the mode how URPF examines the incoming packets. (Optional) Specifies to verify if the source address is present in the routing table (sometimes referred to as the loose mode). (Optional) Specifies to verify if the source address is present in the routing table and the incoming interface matches the source and is reachable through the interface on which the packet was received (sometimes referred to as the strict mode). This is the default option. (Optional) Specifies allowing the use of the default route for URPF verification. (Optional) Specifies the name of the IPv4 ACL to be checked. (Optional) Specifies the name of the IPV6 ACL to be checked. Default By default, URPF checking is not performed. By default, the checking mode is RX. By default, allow-default is disabled. By default, no IPv4/IPv6 access list is specified. Command Mode Interface Configuration Mode. Command Default Level Level: 12. Usage Guideline Unicast RPF helps to mitigate problems caused by the introduction of malformed or forged IPv4/IPv6 source addresses into a network by discarding IPv4/IPv6 packets that lack a verifiable IPv4/IPv6 source address. When Unicast RPF is effectively enabled on an interface, the Switch examines all IPv4 and IPv6 packets received as input on that interface to make sure that the source address and source interface appear in the routing table and match the interface on which the packet was received. The reverse path checking will not be performed in the following situations: • The destination IPv4/IPv6 address is not a unicast address. • The source IP address is an IPv6 address and the address is a link-local address. • The received packet is a BOOTP/DHCP packet (the source IP is 0.0.0.0 and destination IP is 255.255.255.255). 1584
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