问题 I am using OMNET++ 5.5.1 with INET 4 framework. In INET MAC protocols, each protocol has a fixed header structure. For example in XMAcHeader.msg, the MAC header defined as below: class XMacHeaderBase extends FieldsChunk { MacAddress srcAddr; MacAddress destAddr; XMacTypes type; } I want to extend this header structure where the MAC header will contain an additional bit along with the source address, destination address and type. I have to set/reset that bit before transmitting the packet to