Connectivity issues when using Emulex elxnet Driver
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Connectivity issues when using Emulex elxnet Driver


Article ID: 328114


Updated On:




This article addresses a known issue with the elxnet native driver jointly developed by VMware and Emulex for certain network adapters.

In ESXi 5.5 environment having OCe10102 and OCe11102 adapters using Emulex elxnet driver version earlier than and configured for port mirroring, VLAN Tagging, VMware NSX, or VXLAN bridging, you may experience these symptoms:
  • Packets get dropped, resulting in intermittent connectivity issues and loss of ping packets.
  • You experience packet loss for packets that get malformed or dropped by the NIC.
  • An example of such traffic is ARP or OSPF packets.
  • The issue resolves itself and the connectivity is randomly lost and restored on its own.
  • Packet captures done on switch ports between the hosts may show malformed packets and packets with incorrect checksum.
  • Packet captures done on switch ports between the hosts may show an unexpectedly long number in the length field of the IP header and random data added to the end of the packet.


Packets may become malformed, causing dropped connections. This problem manifests when a packet received on an Emulex NIC is forwarded out to the same or a different Emulex NIC. This issue has been seen in environments that use Emulex cards having VID/DID 19a2:0710, and 19A2:0700 (search the VMware IO Devices HCL for these vendor and device IDs).


This issue is resolved in Emulex elxnet Driver version, available at VMware Downloads.

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OCe10102 アダプタや OCe11102 アダプタ、または OEM に相当するもので Emulex elxnet Driver バージョン 以前を使用している場合のパケット ドロップおよび接続の問題
在使用 Emulex elxnet 驱动程序时出现连接问题