packet

I don't want to modify the ethernet portions of the frame, but I need to modify the IP packet and the data portion of the frame. I try sending a raw frame and it still puts in the IP information. I basically need to send a frame without defining the endpoint except in the bits I'm sending. Here's what I got: Socket s = new Socket(AddressFamily.Unspecified, SocketType.Raw, ProtocolType.Raw); EndPoint ep = new IPEndPoint(IPAddress.Parse("205.188.100.58"),80); s.SendTo(GetBytes(""),ep); //im sending nothing, so i expect the frame to just have ethernet stuff s.SetSocketOption(SocketOptionLevel.IP,

Question Should one discard a packet with an unknown IPv6 extension header? Details I could not find an answer to this question by examining the RFC . The book IPv6 Essentials states on page 22: If a node is required the next header but cannot identify the value in the Next Header field, it is required to discard the packet and send an ICMPv6 Parameter Problem message back to the source of the packet. I read this as: a IPv6 packet with a custom extension header cannot will be dropped unless all IPv6 stacks along the path know how to deal with the header. Or equivalently, if a single IPv6

I'm using 2 computers with an application to send and receive udp datagrams. There is no flow control and ICMP is disabled. Frequently when I send a file as UDP datagrams via the application, I get two packets changing their order and therefore - packet loss. I've disabled and kind of firewall and there is no hardware switch connected between the computers (they are directly wired). Is there a way to make sure Winsock and send() will send the packets the same way they got there? Or is the OS doing that? Or network device configuration needed? UDP is a lightweight protocol that by design doesn

In a client/server application were text data of varying length will be sent back and forth between the client and server, how should I mark the end of a packet that is being sent? For example, when the server is receiving packet data from a client how does the server know that the client packet has fully been received? Is it more common to tell the server the full length of the packet that it is going to receive before the data or to have something marking the end of the packet? Some of the data sent will only be a few characters long and some could be thousands of characters. TCP provides a

I am working on a websocket implementation and do not know what the sense of a mask is in a frame. Could somebody explain me what it does and why it is recommend? 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-------+-+-------------+-------------------------------+ |F|R|R|R| opcode|M| Payload len | Extended payload length | |I|S|S|S| (4) |A| (7) | (16/64) | |N|V|V|V| |S| | (if payload len==126/127) | | |1|2|3| |K| | | +-+-+-+-+-------+-+-------------+ - - - - - - - - - - - - - - - + | Extended payload length continued, if payload len == 127 | + - - - - - - -