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Current Internet architecture is vulnerable to IP address spoofing attacks. Ingress filtering and unicast reverse path forwarding (uRPF) allow IP source address validation at an aggregated level. Up to date, Internet architecture still lacks for a fine-grained intradomain filtering at the host level. The possibility of IP address forging by an attacker located inside of the local network leads to the untraceable attacks. In this paper we present source address validation for IPv6, a mechanism for a fine-grained intradomain filtering, based on the creation of a trust chain between the source IP address and associated Layer-2 binding anchor. The proposed solution relies on existing protocols and mechanisms, in particular in the usage of secure neighbor discovery (SEND) protocol and cryptographically generated addresses (CGAs).