tcp

问题 I have some documents which I have to fetch from mongodb and set it to memcache. Here is the code import memcache from pymongo import MongoClient db = mongo_client.job_db.JobParsedData jobs = db.find().sort("JobId", 1) def set_to_memcache_raw(jobs): print("Setting raw message to memcache") count = 0 for item in jobs: job_id = item.get('JobId') job_details = item.get('JobDetails') if job_id.strip(): count += 1 memcache_obj.set(job_id, job_details, time=72000) if count % 1000 == 0: print(

问题 I am writing a client/server program in boost TCP in which I want to send a HEARTBEAT message to the client every 2 seconds for which I am trying to create a new thread by which I can send it easily but unable to solve it. I am creating thread using boost::thread t(hearbeatSender,sock); this. but giving lots of errors. I also use bind to bind function name with the socket but not resolved the error. void process(boost::asio::ip::tcp::socket & sock); std::string read_data(boost::asio::ip::tcp:

问题 I've been trying to make a simple daemon in Rust that will listen to a port using tcp_stream and print the message. However, I'm running into two problems: 1) If my daemon uses println!, it crashes. If I remove all mentions of println!, the daemon works. How does stdout/stdin work when making a daemon? One source I found on the Rust mailing list says "With modern init systems, such as systemd or launchctl, this works very nicely and application developer doesn't have to care about

问题 I've been trying to make a simple daemon in Rust that will listen to a port using tcp_stream and print the message. However, I'm running into two problems: 1) If my daemon uses println!, it crashes. If I remove all mentions of println!, the daemon works. How does stdout/stdin work when making a daemon? One source I found on the Rust mailing list says "With modern init systems, such as systemd or launchctl, this works very nicely and application developer doesn't have to care about

问题 I have configured HAProxy (1.5.4, but I tried also 1.5.14) to balance in TCP mode two server exposing AMQP protocol (WSO2 Message Broker) on 5672 port. The clients create and use permanent connection to the AMQP Servers, via HAProxy. I've changed the client and server TCP keepalive timeout, setting net.ipv4.tcp_keepalive_time=120 (CentOS 7). In HAProxy I've setted timeout client/server to 200 seconds (>120 seconds of the keepalive packets) and used the option clitcpka. Then I've started

问题 import socket s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect(("HOST", PORT)) This code surely send a SYN packet to HOST, but does it complete the three-way handshake? Does it send the ACK packet to HOST? If not, how can I make socket not sending the ACK packet? That's because I'm trying to study the syn flood flaws and how this attack works. So SYN packets are sent but no ACK packets response are sent. 回答1: The .connect() call is asking the kernel to setup a usable socket

问题 import socket s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect(("HOST", PORT)) This code surely send a SYN packet to HOST, but does it complete the three-way handshake? Does it send the ACK packet to HOST? If not, how can I make socket not sending the ACK packet? That's because I'm trying to study the syn flood flaws and how this attack works. So SYN packets are sent but no ACK packets response are sent. 回答1: The .connect() call is asking the kernel to setup a usable socket

问题 even though a lot was said on the topic, I am still stumped. I experiment with a monster linux server capable of handling proper load ramps, presumably many thousand connections a second. Now, if i check default listen() queue: #cat /proc/sys/net/core/somaxconn 128 which couldn't be actual queue size at all. I suspect it might be a legacy, and actual size is given by this: #cat /proc/sys/net/ipv4/tcp_max_syn_backlog 2048 However, man tcp says the latter is connections awaiting ACK from

问题 I'm trying to upgrade from UDP to TCP, but I am completely lost. :( This is my Server code (not too long). private readonly TcpListener _tcpListener; public TCP(IPEndPoint endPoint) { try { _tcpListener = new TcpListener(endPoint); _tcpListener.Start(); AcceptTcpClient(); AcceptSocket(); TestClient test = new TestClient(); test.Connect(); } catch (SocketException e) { Console.WriteLine("SocketException: " + e); } finally { _tcpListener.Stop(); } } private void AcceptSocket() { _tcpListener

问题 When I use Javaa's Socket class to send out a byte array, does the write call in the following code block until it has verified that the recipient has received the data? byte data[] = ...; Socket socket = ...; socket.getOutputStream().write(data); // blocking ? The reason I ask, is if I have a list of sockets that I want to send the same data to, I want to send it as efficiently as possible, i.e., is there a better way than this: ArrayList<Socket> sockets = ...; byte data[] = ...; for(int i =