Jumbo frames between OMV and Windows

    • OMV 1.0

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    • Jumbo frames between OMV and Windows

      Hello again.
      I have a direct connection between OMV and Windows 2003 without a switch.
      What MTU size should I set on OMV to talk with Windows Intel NIC without packet fragmentation?
      On Windows I have on the driver predefined options to set MTU - including 9014.
      When I run on this Windows command netsh int ip show int then I see that MTU size is 9000.
      When I set on OMV MTU for this device to 9000 and I run some test I have fragmentation info.
      On windows I run ping -f -l 9000 10.101.5.100 I get Packet needs to be fragmented but DF set.
      On OMV I run ping -M do -s 8972 10.101.5.1 I get Frag needed and DF set (mtu = 9000).
      What should be set on both ends to work properly without fragmentation?
      Best regards. Pawka
    • Hi,

      fakamaka wrote:

      On windows I run ping -f -l 9000 10.101.5.100 I get Packet needs to be fragmented but DF set.


      that is understandable: IPv4 and ICMP header need 28 bytes.
      So it should work with
      ping -f -l 8972 10.101.5.100

      fakamaka wrote:

      On OMV I run ping -M do -s 8972 10.101.5.1 I get Frag needed and DF set (mtu = 9000).


      But this should work.

      I would reduce the paketsize until they don't get fragmented anymore and then try to understand the value. ?(