0 Replies Latest reply on Sep 4, 2015 6:37 AM by patpat

    Workstation 12 IP fragmentation issue

    patpat Enthusiast

      Test scenario:

       

      Host Hardware:HP Elitebook 8470p
      Intel(R) Core(TM) i7-3630QM CPU @ 2.40 GHz, 16GB RAM
      Host OS:Windows 8.1 Pro
      VMware:Workstation  12
      PXE server:Serva
      Boot Manager:MS bootmgfw.efi
      Client Preboot Environment:EFI 64 (VMware FW)
      NIC Driverdefault ("vlance")

       

      When PXE booting a client under Workstation EFI, loading the NBP (bootmgfw.efi) leads to IP fragmentation if using the "default" NIC driver.

      IP fragmentation + PXE/TFTP => huge delay and error prone.

       

      If I use the NIC driver "e1000e" instead the transfer does not present IP fragmentation.

       

      VMware12_Client.png

       

      The Host PC MTU always 1500


      > netsh interface ipv4 show subinterfaces

       

      HostMTU.png

       

       

      It seems Workstation 12 client (default NIC) when TFTP retrieving the PXE NBP it agrees blocksize=1486 when the maximum

      blocksize for avoiding IP fragmentation with the default MTU=1500 is in fact 1468

       

      Best,

      Patrick