tcp-keepalive | 易学教程

How do connections recycle in a multiprocess pool serving requests from a single requests.Session object in python?

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问题 Below is the complete code simplified for the question. ids_to_check returns a list of ids. For my testing, I used a list of 13 random strings. #!/usr/bin/env python3 import time from multiprocessing.dummy import Pool as ThreadPool, current_process as threadpool_process import requests def ids_to_check(): some_calls() return(id_list) def execute_task(id): url = f"https://myserver.com/todos/{ id }" json_op = s.get(url,verify=False).json() value = json_op['id'] print(str(value) + '-' + str

how to detect TCP keep alive packets and keep connection open

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问题 I wrote my own server with epoll. When I sent TCP keep alive packages from client to server, epoll event will not get triggered. Question: I want my server to keep the connection open when server gets tcp keep alive packages. I also tried to look at tcp info but there are no update for its attributes when server got keep alive packages. I understand tcp keep alive packages is no data but header. I saw in my tcpdump, kernel sent back tcp keep alive ACK after received keep alive package. My

How to set TCP keep alive interval for a specific socket fd (Not system wide) in VxWorks?

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问题 I created a TCP socket in an application with KEEPALIVE enabled for this socket. I can see that keepalive packets are coming with the frequency of keepalive interval which i have already set in my system variable of iptcp, i.e 30secs. Socket Creation: if( ( sockFD = socket( AF_INET, SOCK_STREAM, 0 ) ) == ERROR ) { DS_SWX_ERROR( "socket(%d,%d,%d) failed.", AF_INET, SOCK_STREAM, 0 ); return; } VxWorks TCP System Variables: [vxWorks *]# sysvar list iptcp System variables: iptcp.KeepCnt=3 iptcp

How to use TCP keep_alive property to get notified on the event of a unresponsive peer?

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问题 Scenario: I have a client and server written using boost::asio 1.63. Generally the connection and communication part works well and great. I have written a Watchdog on both sides which send dummy packets to peers in an interval of 2 seconds each. The objective of the watchdog is that the concerned peer reports a connection error if it does not receive the dummy packet it is expecting in the next 2 seconds. This is even more important for me because it might happen the 2 peers are not

How to set TCP keep Alive in java from httpclient

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问题 My java application which resides in AWS private subnet connects to an http server via AWS Nat gateway. I am calling a POST request via httpclient to the HTTP server. That request will take more than 10 minutes to complete. I have configured a socket time out and connection timeout of 1 hour as this this a background task . But the intermediate AWS NAT gateway will send back a RST packet after 300 secs [5 mins] and cause the connection to get resetted , there is no way i can increase the NAT

What is the typical usage of TCP keepalive?

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问题 Consider a scenario where exists one server and multiple clients. And each client creates TCP connections to interact with the server. There are three usages of TCP alive: Server-side keepalive: The server sends TCP keepalive to make sure that the client is alive. If the client is dead, the server closes the TCP connection to the client. Client-side keepalive: Clients sends TCP keepalive to prevent the server from closing the TCP connection to the client. Both-side keepalive: Both server and

What is the typical usage of TCP keepalive?

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Consider a scenario where exists one server and multiple clients. And each client creates TCP connections to interact with the server. There are three usages of TCP alive: Server-side keepalive: The server sends TCP keepalive to make sure that the client is alive. If the client is dead, the server closes the TCP connection to the client. Client-side keepalive: Clients sends TCP keepalive to prevent the server from closing the TCP connection to the client. Both-side keepalive: Both server and clients send TCP keepalive as described in 1 and 2. Which of the above usages of TCP keepalive are

TCP keep_alive does not work if you switch off wifi to cause an abrupt connection loss

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问题 Scenario: I have a client and server written using boost::asio 1.63. I am using keep_alive feature in tcp sockets to detect connection losses. Following is the keep_alive code setup. boost::asio::io_service ioService; boost::asio::ip::tcp::socket mySocket(ioService); #ifdef __APPLE__ unsigned int timeoutMillis = 2000; struct timeval tvs; tvs.tv_sec = timeoutMillis / 1000; tvs.tv_usec = (timeoutMillis % 1000) * 1000; if (setsockopt(mySocket.native_handle(), SOL_SOCKET, SO_RCVTIMEO, &tvs,