The importance of symmetric hashing for load balancing

SADA Says | Cloud Computing Blog

By SADA Engineering

For Cloud Environments, symmetric hashing is incredibly valuable when dealing with stateful network appliances or applications. Typically, network appliances or applications deployed in GCP provide advanced Layer 7 functionality, such as protocol inspection or HTTPS parsing for malicious payloads. These devices often need to participate in both the request and response portions of the TCP flow.

Additionally, for high-availability environments, symmetric hashing is critical for ensuring data integrity as all session data utilizes the same firewall route and target compute node. Active-active load balancing requires symmetric hashing as session integrity is required. Without the hash and session integrity, these stateful capabilities are not available.

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