packets

问题 This question is admittedly overlapping with iSCSI Packet Header but I hope for a more specific answer than provided for that one for my more specific question. Question: How much overhead is introduced by iSCSI and SCSI in the transfer of the data to read or write? I understand that this is done in the Data-In and Data-Out transport packets and I understand there is overhead from TCP/IP and Ethernet, but what additional overhead is needed by iSCSI/SCSI? I recognize that SCSI Protocol Data

问题 I've been trying to write a script that will sniff HTTP headers. So far I've got the socket bound to port 80 and packets seem to be received, but I can't get them into string form. All that outputs is "E" continuously. I changed the bytes into hex earlier and there seems to be some data coming in, but the current code is unable to change the bytes into a string. Is there some other way of decoding the bytes that will give a proper string? byte[] input = BitConverter.GetBytes(1); byte[] buffer

问题 I'm trying to build a dns packet to send over a socket. I don't want to use any libraries because I want direct access to the socket variable that sends it. Whenever I send the DNS packet, wireshark says that it's malformed. What exactly am I doing wrong? Some things that are wrong with the Dns packet itself: It says it has 256 questions, no class and no type class DnsPacketBuilder: def __init__(self): pass def build_packet(self, url): packet = struct.pack("H", 12049) # Query Ids (Just 1 for

问题 Regardless of if I do scapy or Python from scapy.all import * it simply crashes python. It says "Python is not responding" with the classic little bar that does nothing. I'm currently on Win10. There's only one other person that I found had this problem, and nobody bothered to answer him, couldn't find anything else about this. I've tried multiple installers from differently packaged ones. No can do. I'm about to go raving mad. Many thanks in advance. 回答1: Well, nobody put an answer, but I

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 6 years ago . Also, that we can specifically know which running program is using certain ports and what kind of information they are sending and

问题 I am using Netty to send objects over a Socket. It works fine except when I try to send this one type of Packet, I get this error on the receiving side [16:57:14] [nioEventLoopGroup-3-1/INFO]: [Castle_Defense_Lobby] Connected to proxy [16:57:14] [nioEventLoopGroup-3-1/ERROR]: Unexpected exception from downstream, disconnecting... io.netty.handler.codec.DecoderException: java.io.InvalidClassException: failed to read class descriptor at io.netty.handler.codec.ByteToMessageDecoder.callDecode

问题 This is regarding the amazon hosting. Sometimes, the server doesn't respond with packets greater than a specific length (about 1400 characters). So any operation would work if it involve downloading/reading of packets within that length; while the requests greater than these lengths are not received by the client. Every other website works. For example, if you are making a WinSCP connection, authentication etc. will be done but it won't be able to execute the commands as simple as "ls" or

问题 in my application i'm building a frontend website (build on React) and i use PHP as my backend. I keey getting the error: jquery.js:9600 Failed to load http://localhost:81/: The value of the 'Access-Control-Allow-Credentials' header in the response is '' which must be 'true' when the request's credentials mode is 'include'. Origin 'http://localhost:3000' is therefore not allowed access. The credentials mode of requests initiated by the XMLHttpRequest is controlled by the withCredentials

问题 I recently began to use the scapy library for Python 2.x I found there to be minimal documentation on the sniff() function. I began to play around with it and found that I can veiw TCP packets at a very low level. So far I have only found informational data. For example: Here is what I put in the scapy terminal: A = sniff(filter="tcp and host 216.58.193.78", count=2) This is a request to google.com asking for the homepage: <Ether dst=e8:de:27:55:17:f3 src=00:24:1d:20:a6:1b type=0x800 |<IP

问题 I am new to serial communication. I have read a fair few tutorials, and most of what I am trying to do is working, however I have a question regarding serial communication with C#. I have a micro controller that is constantly sending data through a serial line. The data ist in this format: bxxxxixx.xx,xx.xx* where the x's represent different numbers, + or - signs. At certain times want to read this information from my C# program on my PC. The problem that I am having is that my messages seem