public IPHeader(byte[] byBuffer, int nReceived)
{
NetBinaryReader nbr = new NetBinaryReader(byBuffer, 0, nReceived);
Version = nbr.ReadNible();
HeaderLength = nbr.ReadNible();
Precedence = (Precedence)nbr.ReadCustomAmount(3);
LowDelay = nbr.ReadBit();
HighThroughput = nbr.ReadBit();
HighRelibility = nbr.ReadBit();
nbr.SkipPadBits();
TotalLength = nbr.ReadUInt16();
Identification = nbr.ReadUInt16();
nbr.ReadBit();
MayFragment = !nbr.ReadBit();
LastFragment = !nbr.ReadBit();
FragmentOffset = (nbr.ReadPadBits() << 3) + nbr.ReadByte();
TTL = nbr.ReadByte();
Protocol = (ProtocolType)nbr.ReadByte();
HeaderChecksum = IPAddress.NetworkToHostOrder(nbr.ReadInt16());
Source = new IPAddress(nbr.ReadBytes(4));
Destination = new IPAddress(nbr.ReadBytes(4));
}