The Data Packet With Type-0x96- Returned Was Misformatted -

[2025-01-15 08:23:17] [ERR] Interface eth0: The data packet with type-0x96- returned was misformatted. Expected length 44 bytes, got 31 bytes. CRC mismatch. Packet dropped. Or a minimalist version:

import socket ETH_P_CUSTOM = 0x96 sock = socket.socket(socket.AF_PACKET, socket.SOCK_RAW, socket.htons(ETH_P_CUSTOM)) sock.bind(('eth0', 0)) Build a minimal plausible 0x96 packet (example) correct_packet = bytes([0x96, 0x00, 0x01, 0x00, 0x04, 0xDE, 0xAD, 0xBE, 0xEF]) sock.send(correct_packet) Step 5: Check Peer Device Configuration Many industrial devices allow you to disable validation of type 0x96 packets via a "compatibility mode." While not a fix, it can help isolate the culprit. Part 5: Remediation Strategies | Scenario | Fix | |----------|-----| | Firmware mismatch | Upgrade both sender and receiver to same version. | | Corrupt NIC driver | Reinstall driver; disable hardware offloading (checksum, TSO). | | Switched infrastructure | Replace faulty switch; disable storm control or packet truncation. | | Bad cable / interference | Replace Ethernet cable; check for EMI sources. | | Malformed from external | Block UDP/TCP ports used for 0x96 (e.g., via ACL). | the data packet with type-0x96- returned was misformatted

The error typically triggers at the after hardware CRC has already passed. Part 3: Common Root Causes 3.1 Firmware Bugs (Most Common) Embedded devices often implement custom lightweight protocols to save memory. A firmware update may accidentally send an older version’s packet layout. [2025-01-15 08:23:17] [ERR] Interface eth0: The data packet