MSS:Maximum Segment Size 最大的段大小
The largest amount of data that can be received in a single TCP segment, specified in octets
MTU: maximum transmission unit
Specifies the maximum transmission unit (MTU) of the EthIfCtrl in bytes.
Parameter: /EthIf/EthIfConfigSet/EthIfController/EthIfCtrlMtu
The relationship between the MSS value and the MTU (Maximum Transmission Unit) is
MSS = MTU - (TCP Header Size + IP Header Size).
