如何使用CANoe测试真实ECU？——VN5610A与CANoe.ethernet环境下诊断请求无法抵达ECU的问题问询

Hey there, let’s walk through the key checks to get your DoIP diagnostics requests hitting that ECU. Based on your mention of DoIP/HFSZ and TCP/IP stack settings in the Trace, here’s what to verify step by step:

• DoIP Entity Configuration in CANoe

  • First, confirm your CANoe project’s DoIP setup aligns with the ECU’s requirements:
    • Double-check the Logical Address (target ECU’s DoIP logical address) is correctly entered in the DoIP configuration panel—mismatched addresses are one of the most common culprits here.
    • Verify the Activation Type (static IP vs. DHCP) matches how the ECU is configured. If the ECU uses a static IP, ensure your VN5610A’s Ethernet port is in the same subnet.
    • Cross-reference the DoIP Port Number (default is 13400 for diagnostics) with the ECU’s technical docs—some ECUs use custom ports that need explicit setup in CANoe.

• HFSZ & Fragmentation Settings

  • The Trace mention of HFSZ points to potential MTU mismatches, which break DoIP packet delivery:
    • In CANoe’s DoIP settings, make sure the Maximum Transmission Unit (MTU) matches both the VN5610A’s Ethernet port MTU (usually 1500 bytes for standard Ethernet) and the ECU’s supported MTU.
    • If your diagnostics requests are larger than the MTU, confirm IP Fragmentation is enabled in both CANoe’s TCP/IP stack configuration and on the ECU side. Disabled fragmentation will cause oversized packets to be dropped silently.
    • Some ECUs enforce a specific HFSZ (Host Firewall Size) value (per ISO 13400). Adjust CANoe’s setting to match the ECU’s requirement if this is flagged in the Trace.

• VN5610A TCP/IP Stack & Port Configuration

  • Even with basic hardware setup done, dig into port-specific details:
    • Open Vector Hardware Manager, select your VN5610A, and navigate to the Ethernet port used for DoIP:
      • Confirm the IP address (static or DHCP-assigned) is in the same subnet as the ECU. Test connectivity first by running ping <ECU_IP> from your PC (or via the VN5610A’s built-in terminal if available).
      • Check that no firewall rules or port forwarding settings are blocking the DoIP diagnostic port (13400 by default). Some VN5610A configurations restrict incoming/outgoing traffic on non-standard ports.
      • Ensure the Ethernet Link Speed/Duplex (e.g., 1000Mbps Full Duplex) matches the ECU’s Ethernet port capabilities. Mismatched settings often cause packet loss or intermittent connectivity.

• ECU-Side & Physical Link Checks

  • Don’t overlook the ECU itself and the physical layer:
    • Verify the ECU’s DoIP module is activated—some ECUs require a wake-up signal or initialization sequence before accepting diagnostics over Ethernet.
    • Use a known-good CAT5e/CAT6 cable, and confirm both ends are securely connected to the VN5610A and ECU. Faulty cables or loose connections are easy to miss.
    • Check if the ECU has active security measures (like authentication or encryption) blocking unauthenticated requests. You might need to send a session setup or auth request first before your target diagnostic message.

Once you’ve worked through these checks, re-run your Trace and see if the requests start reaching the ECU. If you’re still stuck, sharing a redacted snippet of the Trace output would help narrow down the exact issue.

内容的提问来源于stack exchange，提问作者AutoBeginner