private DhcpV4Message BuildReleaseMessage(DhcpV4Message ack)
{
DhcpV4Message msg = new DhcpV4Message(null, new IPEndPoint(serverAddr, serverPort));
msg.SetOp((short)DhcpConstants.V4_OP_REQUEST);
msg.SetTransactionId(ack.GetTransactionId());
msg.SetHtype((short)1); // ethernet
msg.SetHlen((byte)6);
msg.SetChAddr(ack.GetChAddr());
msg.SetGiAddr(clientAddr); // look like a relay to the DHCP server
msg.SetCiAddr(ack.GetYiAddr());
DhcpV4MsgTypeOption msgTypeOption = new DhcpV4MsgTypeOption();
msgTypeOption.SetUnsignedByte((short)DhcpConstants.V4MESSAGE_TYPE_RELEASE);
msg.PutDhcpOption(msgTypeOption);
return(msg);
}
private static void V4Release()
{
var V4Message = new DhcpV4Message(IPAddress.Any,
new IPEndPoint(IPAddress.Parse("192.168.61.48"), DhcpConstants.V4_SERVER_PORT));
V4Message.SetOp((short)DhcpConstants.V4_OP_REQUEST); //V4_OP_REQUEST
V4Message.SetGiAddr(IPAddress.Parse("192.168.101.1"));
V4Message.SetCiAddr(IPAddress.Parse("192.168.5.126"));
V4Message.SetChAddr(PhysicalAddress.Parse("9C-EB-E8-28-92-D4").GetAddressBytes());
V4Message.SetHlen(6);
V4Message.SetHtype((byte)6);
V4Message.SetTransactionId(-1729018559);
DhcpV4MsgTypeOption msgTypeOption = new DhcpV4MsgTypeOption();
msgTypeOption.SetUnsignedByte((short)DhcpConstants.V4MESSAGE_TYPE_RELEASE);
V4Message.PutDhcpOption(msgTypeOption);
var message = DhcpV4MessageHandler.HandleMessage(
IPAddress.Parse("192.168.61.48"), V4Message);
Console.WriteLine(V4Message.ToString());
}