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第二篇 Python ping 网络连通性检测

  • 2026-03-26 09:23:24
第二篇 Python ping 网络连通性检测

前一篇学习了获取本地 IP,这一篇学习如何批量检测网络中的设备是否在线。ping 是网络运维中最基础的诊断工具。

本篇使用 subprocess 调用系统 ping 命令,结合 threading 多线程实现高效的并发检测。

安装依赖

💡 提示

本篇只需要 Python 内置模块,无需额外安装。

方案一:单线程 ping

最基础的方式,直接调用系统 ping 命令:

Python 代码

import subprocessimport platformdef ping_host(host, count=4, timeout=2):    try:        if platform.system() == 'Windows':            cmd = ['ping''-n'str(count), '-w'str(timeout * 1000), host]        else:            cmd = ['ping''-c'str(count), '-W'str(timeout * 1000), host]        result = subprocess.run(cmd, capture_output=True, timeout=timeout + 5, text=True)        if result.returncode == 0:            output = result.stdout            if 'Average' in output:                avg_time = output.split('Average = ')[1].split('ms')[0]                return Truef"{avg_time}ms"            elif 'min/avg/max' in output:                avg_time = output.split('min/avg/max/')[1].split(' ')[0]                return Truef"{avg_time}ms"            else:                return True"在线"        else:            return False"无响应"    except subprocess.TimeoutExpired:        return False"超时"    except Exception as e:        return Falsestr(e)if __name__ == '__main__':    hosts = ['8.8.8.8''192.168.1.1''10.0.0.1']    for host in hosts:        online, time_info = ping_host(host)        status = "在线" if online else "离线"        print(f"{host}{status} ({time_info})")

方案二:多线程并发 ping

单线程太慢,用多线程加速。检测 254 个 IP 从 10 分钟降低到 30 秒。

Python 代码

import subprocessimport threadingimport platformfrom datetime import datetimeclass PingScanner:    def __init__(self, max_threads=50):        self.max_threads = max_threads        self.results = []        self.lock = threading.Lock()    def ping_host(self, host):        try:            if platform.system() == 'Windows':                cmd = ['ping''-n''1''-w''1000', host]            else:                cmd = ['ping''-c''1''-W''1000', host]            result = subprocess.run(cmd, capture_output=True, timeout=3, text=True)            online = result.returncode == 0            with self.lock:                self.results.append({'host': host, 'online': online})            return online        except:            with self.lock:                self.results.append({'host': host, 'online'False})            return False    def scan_network(self, network_prefix, start=1, end=254):        threads = []        for i in range(start, end + 1):            host = f"{network_prefix}.{i}"            while threading.active_count() > self.max_threads:                threading.Event().wait(0.1)            t = threading.Thread(target=self.ping_host, args=(host,))            t.daemon = True            t.start()            threads.append(t)        for t in threads:            t.join()        return [r['host'for r in self.results if r['online']]if __name__ == '__main__':    scanner = PingScanner(max_threads=50)    online_hosts = scanner.scan_network('192.168.1', start=1, end=254)    print(f"在线主机数: {len(online_hosts)}")    for host in sorted(online_hosts):        print(f"  - {host}")

性能对比

📊 性能提升

单线程检测 254 个 IP 需要约 10 分钟,多线程(50 个线程)仅需 30 秒。

注意事项

  1. 权限要求
    :Linux 下 ping 可能需要 root 权限
  2. 网络礼仪
    :只扫描自己管理的网络,不要扫描公网 IP
  3. 防火墙
    :某些防火墙会阻止 ICMP 包
  4. 性能优化
    :根据网络状况调整超时时间

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  1. CONNECT:[ UseTime:0.000380s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000504s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.003509s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.002632s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000566s ]
  6. SELECT * FROM `set` [ RunTime:0.003159s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000605s ]
  8. SELECT * FROM `article` WHERE `id` = 482926 LIMIT 1 [ RunTime:0.007600s ]
  9. UPDATE `article` SET `lasttime` = 1774587643 WHERE `id` = 482926 [ RunTime:0.004850s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.005859s ]
  11. SELECT * FROM `article` WHERE `id` < 482926 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.003830s ]
  12. SELECT * FROM `article` WHERE `id` > 482926 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.004242s ]
  13. SELECT * FROM `article` WHERE `id` < 482926 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.008049s ]
  14. SELECT * FROM `article` WHERE `id` < 482926 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.015178s ]
  15. SELECT * FROM `article` WHERE `id` < 482926 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.015027s ]
0.169080s