Wednesday, 31 March 2021

Python - Not Expecting Data by Unpacking Ethernet Frame Getting 0xc0a8 on Type Expecting 0x800

I have this Python function which unpacks ethernet frame:

ethernet frame

def ethernet_frame(data):
        ipheader = struct.unpack('!6s6sH', data[0:14])
        dest_mac = binascii.hexlify(ipheader[0])
        src_mac = binascii.hexlify(ipheader[1])
        proto = ""

        protoType = ipheader[2]
        nextProto = hex(protoType)
        
        print(nextProto)
        if(nextProto == '0x800'):
            proto = 'IPV4'
        elif(nextProto == '0x86dd'):
            proto = 'IPV6'
        print(nextProto)
        
        return dest_mac, src_mac, proto, data[14:]

I was expecting to get 0x800 for IPV4 or 0x86dd for IPV6. But after unpacking the frame I got 0xc0a8. Can someone explain why I'm getting this unexpected data? and how to fix it to get correct data?



from Python - Not Expecting Data by Unpacking Ethernet Frame Getting 0xc0a8 on Type Expecting 0x800

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