In some rare cases Windows Server 2008 R2 is also affected. Support cases involving the following NICS have been opened but other make and model NICs could be impacted.Īffected NIC driver versions for the HP-branded 1 GB Broadcom NICs start with version 7.4.X.X. Software developers have been known to configure > 1500 byte MTUs as was the case when several drivers for HP-branded Broadcom NICs slipped out the door with a default MTU of 1514 bytes. Larger MTU support (jumbo frames) may be configured when using overlay technologies like Hyper-V network virtualization and network operators must make sure that all the networking equipment like switches and routers can support larger MTUs. The largest packet allowed by Ethernet networking layer is 1500 bytes.Maximum Transfer Unit (MTU) specifies the maximum packet size for a given network interface.Each network media type has a maximum frame size.As this blog post will illustrate, connectivity failures caused by this condition can cause an array of operational failures as simple a file copy to RPC connectivity disruptions used by numerous management and distributed operations on Windows computers. Problems arise when such large packets cannot be passed by the underlying network infrastructure. Greg Jaworski here to make readers aware of a support issue where network interface drivers may set an overly large MTU value of 1514 bytes. First published on TechNet on Dec 01, 2014
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