How to change tcp keepalive timer using python script?

You can set the TCP keepalive timers on an already-open socket using setsockopt().

import socket

def set_keepalive_linux(sock, after_idle_sec=1, interval_sec=3, max_fails=5):
    """Set TCP keepalive on an open socket.

    It activates after 1 second (after_idle_sec) of idleness,
    then sends a keepalive ping once every 3 seconds (interval_sec),
    and closes the connection after 5 failed ping (max_fails), or 15 seconds
    """
    sock.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
    sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPIDLE, after_idle_sec)
    sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPINTVL, interval_sec)
    sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPCNT, max_fails)

def set_keepalive_osx(sock, after_idle_sec=1, interval_sec=3, max_fails=5):
    """Set TCP keepalive on an open socket.

    sends a keepalive ping once every 3 seconds (interval_sec)
    """
    # scraped from /usr/include, not exported by python's socket module
    TCP_KEEPALIVE = 0x10
    sock.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
    sock.setsockopt(socket.IPPROTO_TCP, TCP_KEEPALIVE, interval_sec)

For equivalent options on windows refer to msdn. Looking through the Python source, it seems you need to set SO_KEEPALIVE with sock.setsockopt similar to in Unix, and [optionally?] set SIO_KEEPALIVE_VALS with sock.ioctl.

For windows, in python:

This will enable socket keep alive, with a 10 second keep alive time and a 3 second keep alive interval.

sock.ioctl(socket.SIO_KEEPALIVE_VALS, (1, 10000, 3000))

I have combined the above answers and made a single-function version for Linux, Darwin, and Windows.

https://pypi.org/project/keepalive-socket/

pip install keepalive-socket

import socket, keepalive

# keepalive.set(socket, after_idle_sec=60, interval_sec=60, max_fails=5)

client_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
keepalive.set(client_socket)