When Networking Doesn't Work
9 hours ago
- #Checksum Offloading
- #IPMI Troubleshooting
- #Windows Networking
- Tried multiple Windows versions and IPMI software but couldn't connect to an old IPMI module; Linux worked fine.
- Wireshark confirmed outgoing UDP traffic and replies, but Windows TCP/IP stack dropped incoming packets due to invalid checksum, traced via PktMon.
- Disabling IPv4 UDP receive checksum offloading in Intel NIC drivers fixed the issue, indicating a hardware/driver bug causing valid packets to be dropped.
- Problem likely linked to IP header 'Packet ID' field behavior from the IPMI module, but disabling offloading is a workable solution despite driver limitations.