MTU

The MTU of VM instances has to account for the tunnel protocol’s overhead to avoid fragmentation in the underlay network.

This adjusted MTU is advertised automatically by MidoNet via DHCP, but may not be applied depending on the VM’s operating system being used.

Ensure that the VM’s MTU is set accordingly to the underlay’s MTU.

Underlay MTUTunnel ProtocolProtocol OverheadVM’s MTU

1500 bytes

VXLAN

50 bytes

1450 bytes

1500 bytes

GRE

46 bytes

1455 bytes

9000 bytes

VXLAN

50 bytes

8950 bytes

9000 bytes

GRE

46 bytes

8955 bytes

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