Allowing source routed network traffic allows attackers to obscure their identity and location. IP source routing is a mechanism that allows the sender to determine the IP route that a datagram should follow through the network. Vulnerability: Source routing allows a computer that sends a packet to specify the route that the packet takes. Attackers can use source routed packets to obscure their identity and location. Countermeasure: Configure the DisableIPSourceRouting entry to a value of 2. Potential impact: If you configure this value to 2, all incoming source routed packets are dropped. Fix: (1) GPO: Computer Configuration\Windows Settings\Security Settings\Local Policies\Security Options\MSS: (DisableIPSourceRouting IPv6) IP source routing protection level (protects against packet spoofing) (2) REG: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Tcpip6\Parameters!DisableIPSourceRouting