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traffic seen clear with NULL encryption algorithm only if authentication is SHA1, not SHA25. Why ?6

hi, with encryption-alg = null and authentication-alg = hmac-sha1, I can see clear traffic with wireshark option 'attempt to detect/decode NULL encrypted ESP payloads'. with encryption-alg = null and authentication-alg = hmac-sha256, traffic is not decoded. I only see ESP SPI and sequence, not the encapsulated protocol. Why ? thanks and regards

traffic seen clear with NULL encryption algorithm only if authentication is SHA1, not SHA25. Why ?6

hi, with encryption-alg = null and authentication-alg = hmac-sha1, I can see clear traffic with wireshark option 'attempt to detect/decode NULL encrypted ESP payloads'. with encryption-alg = null and authentication-alg = hmac-sha256, traffic is not decoded. I only see ESP SPI and sequence, not the encapsulated protocol. Why ? thanks and regards

ESP traffic seen in clear with NULL encryption algorithm only if authentication is SHA1, not SHA25. Why ?6

hi, with encryption-alg = null and authentication-alg = hmac-sha1, I can see clear traffic with wireshark option 'attempt to detect/decode NULL encrypted ESP payloads'. with encryption-alg = null and authentication-alg = hmac-sha256, traffic is not decoded. I only see ESP SPI and sequence, not the encapsulated protocol. Why ? thanks and regards