Protecting your storage system from forged ICMP redirect attacks

To efficiently route a series of datagrams to the same destination, your storage system maintains a route cache of mappings to next-hop gateways. If a gateway is not the best next-hop for a datagram with a specific destination, the gateway forwards the datagram to the best next-hop gateway and sends an ICMP redirect message to the storage system. By forging ICMP redirect messages, an attacker can modify the route cache on your storage system, causing it to send all of its communications through the attacker. The attacker can then hijack a session at the network level, easily monitoring, modifying, and injecting data into the session.