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L2TPv3 Security – What is the L2TPv3 “Cookie”? The L2TPv3 Cookie is a cryptographically random value, present in each L2TPv3 packet Chosen by the receiver, associated with a Session ID, and signaled to the sender Cookies in the header must match upon receipt, otherwise the packet is dropped Provides an additional layer of security at a very important place: before switching packets out of the core and into the customer premises Casts a strategic balance for the SP: Stronger than ACLs, but less complex than IPSec encryption and key negotiation |