《计算机网络简易速速上手小册》第6章：网络性能优化（2024 最新版）

pip install psutil

import psutil
import time
def monitor_network_traffic(sample_interval=1):
    """
    监控网络流量，并识别假定的视频会议流量
    :param sample_interval: 采样间隔时间（秒）
    """
    while True:
        # 获取网络流量统计
        net_before = psutil.net_io_counters()
        time.sleep(sample_interval)
        net_after = psutil.net_io_counters()
        # 计算这段时间内的流量差异
        bytes_sent = net_after.bytes_sent - net_before.bytes_sent
        bytes_recv = net_after.bytes_recv - net_before.bytes_recv
        print(f"Bytes Sent: {bytes_sent}, Bytes Received: {bytes_recv}")
        # 假设视频会议流量通过特定端口进行
        # 这里的逻辑是示例性的，实际中需要更精确的流量分析
        if bytes_sent > 1000000:  # 假设大于1MB的发送流量为视频会议流量
            adjust_network_priority("video_conference")
def adjust_network_priority(service_type):
    """
    调整网络优先级
    :param service_type: 服务类型
    """
    if service_type == "video_conference":
        print("Adjusting network priority for video conference traffic...")
        # 这里应该包含调整网络优先级的代码
        # 实际应用中，这可能涉及到配置网络设备或使用网络管理工具
        # 例如，使用 Linux tc 工具设置 QoS 策略
        # 这部分代码留作读者实现
if __name__ == "__main__":
    monitor_network_traffic()

# 假设的智能家居设备IP列表
smart_home_devices = {
    'security_camera': '192.168.1.5',
    'smart_tv': '192.168.1.6',
    'thermostat': '192.168.1.7'
}
def monitor_device_traffic(device_ip):
    """
    模拟监控特定设备的网络流量
    :param device_ip: 设备的IP地址
    """
    print(f"Monitoring network traffic for device: {device_ip}")
    # 在实际应用中，这里将包含分析设备流量的代码
    # 可以是通过网络监控工具或自定义脚本实现
    # 示例中仅模拟逻辑
    if device_ip == smart_home_devices['security_camera']:
        # 假设识别到安防摄像头的高优先级流量
        adjust_network_priority_for_device(device_ip, "High")
def adjust_network_priority_for_device(device_ip, priority):
    """
    调整特定设备的网络优先级
    :param device_ip: 设备的IP地址
    :param priority: 优先级
    """
    print(f"Adjusting network priority for device {device_ip} to {priority} priority.")
    # 实际应用中，这里将包含调整设备网络优先级的实际代码
    # 例如，通过配置路由器或交换机的QoS设置
if __name__ == "__main__":
    for device, ip in smart_home_devices.items():
        monitor_device_traffic(ip)

# 假设的在线教育平台服务IP
education_service_ip = '192.168.2.10'
def monitor_education_service_traffic(service_ip):
    """
    模拟监控在线教育服务的网络流量
    :param service_ip: 服务的IP地址
    """
    print(f"Monitoring network traffic for education service: {service_ip}")
    # 在实际应用中，这里将包含分析服务流量的代码
    # 可以是通过网络监控工具或自定义脚本实现
    # 示例中仅模拟逻辑
    # 假设识别到教育服务的高优先级流量
    adjust_network_priority_for_service(service_ip, "High")
def adjust_network_priority_for_service(service_ip, priority):
    """
    调整在线教育服务的网络优先级
    :param service_ip: 服务的IP地址
    :param priority: 优先级
    """
    print(f"Adjusting network priority for education service {service_ip} to {priority} priority.")
    # 实际应用中，这里将包含调整服务网络优先级的实际代码
    # 例如，通过配置路由器或交换机的QoS设置
if __name__ == "__main__":
    monitor_education_service_traffic(education_service_ip)

import itertools
import time
class SimpleLoadBalancer:
    def __init__(self, servers):
        self.servers = servers
        self.server_cycle = itertools.cycle(servers)
    def dispatch_request(self, request):
        """模拟请求分发"""
        selected_server = next(self.server_cycle)
        print(f"Dispatching request '{request}' to server {selected_server}")
        # 在实际应用中，这里会将请求转发到选定的服务器
        self.simulate_server_processing(selected_server)
    @staticmethod
    def simulate_server_processing(server):
        """模拟服务器处理请求"""
        print(f"Server {server} is processing request...")
        time.sleep(1)  # 模拟处理请求需要一定时间
        print(f"Server {server} has finished processing request.")
if __name__ == "__main__":
    servers = ['Server1', 'Server2', 'Server3']
    load_balancer = SimpleLoadBalancer(servers)
    # 模拟10个连续的请求
    for i in range(1, 11):
        load_balancer.dispatch_request(f"Request{i}")

read_servers = ['ReadServer1', 'ReadServer2']
write_servers = ['WriteServer1']
read_server_cycle = itertools.cycle(read_servers)
def route_request(request_type, query):
    """根据请求类型路由到读或写服务器"""
    if request_type == 'read':
        server = next(read_server_cycle)
        print(f"Routing read request '{query}' to {server}")
    elif request_type == 'write':
        server = write_servers[0]  # 假设只有一个写服务器
        print(f"Routing write request '{query}' to {server}")
    else:
        print(f"Unknown request type: {request_type}")
if __name__ == "__main__":
    queries = [('read', 'SELECT * FROM table'), ('write', 'UPDATE table SET column=value')]
    for query in queries:
        route_request(*query)

import random
servers = ['Server1', 'Server2', 'Server3']
healthy_servers = servers.copy()
def health_check():
    """模拟健康检查"""
    for server in servers:
        if random.choice([True, False]):  # 随机决定服务器是否健康
            print(f"{server} is healthy.")
            if server not in healthy_servers:
                healthy_servers.append(server)
        else:
            print(f"{server} is down.")
            if server in healthy_servers:
                healthy_servers.remove(server)
def dispatch_request(request):
    """根据健康检查结果分发请求"""
    if healthy_servers:
        server = random.choice(healthy_servers)  # 从健康服务器中随机选择
        print(f"Dispatching request '{request}' to {server}")
    else:
        print("No healthy servers available to dispatch the request.")
if __name__ == "__main__":
    # 模拟定期健康检查
    for _ in range(3):  # 模拟三次检查过程
        print("\nPerforming health check...")
        health_check()
        dispatch_request("Request1")
        time.sleep(2)  # 假设每次检查间隔2秒

pip install psutil

import psutil
import subprocess
import time
def monitor_bandwidth(interval=1):
    """监控带宽使用情况"""
    old_stats = psutil.net_io_counters()
    time.sleep(interval)
    new_stats = psutil.net_io_counters()
    sent_bytes = new_stats.bytes_sent - old_stats.bytes_sent
    recv_bytes = new_stats.bytes_recv - old_stats.bytes_recv
    print(f"Sent: {sent_bytes} bytes, Received: {recv_bytes} bytes in the last {interval} second(s).")
def ping_host(host="google.com"):
    """测试网络延迟"""
    # Windows系统使用'ping -n 1'，而Linux系统使用'ping -c 1'
    command = ['ping', '-c', '1', host]
    try:
        output = subprocess.check_output(command, stderr=subprocess.STDOUT, universal_newlines=True)
        print(f"Ping {host} successful:\n{output}")
    except subprocess.CalledProcessError as e:
        print(f"Ping {host} failed:\n{e.output}")
if __name__ == "__main__":
    print("Starting network performance monitoring...")
    while True:
        monitor_bandwidth()
        ping_host()
        time.sleep(10)  # 间隔10秒进行下一轮监控

import subprocess
import socket
def ping_device(device_ip):
    """检查设备的可达性"""
    try:
        output = subprocess.check_output(['ping', '-c', '1', device_ip], stderr=subprocess.STDOUT, universal_newlines=True)
        print(f"{device_ip} is reachable.")
    except subprocess.CalledProcessError:
        print(f"{device_ip} is not reachable.")
def check_service_port(device_ip, port):
    """检查设备上的特定端口服务状态"""
    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    sock.settimeout(1)  # 设置超时时间
    result = sock.connect_ex((device_ip, port))
    if result == 0:
        print(f"Service on {device_ip}:{port} is up.")
    else:
        print(f"Service on {device_ip}:{port} is down.")
    sock.close()
if __name__ == "__main__":
    devices = ['192.168.1.1', '192.168.1.2']  # 假设的设备IP列表
    service_ports = [80, 22]  # 常见的Web服务和SSH服务端口
    for device in devices:
        ping_device(device)
        for port in service_ports:
            check_service_port(device, port)

pip install scapy

from scapy.all import sniff
from scapy.layers.http import HTTPRequest
from scapy.layers.inet import IP, TCP
from scapy.layers.dns import DNS
def packet_callback(packet):
    if packet.haslayer(HTTPRequest):
        print("HTTP Request: {} -> {}".format(packet[IP].src, packet[IP].dst))
    elif packet.haslayer(DNS):
        print("DNS Request: {} -> {}".format(packet[IP].src, packet[IP].dst))
if __name__ == "__main__":
    print("Starting network traffic analysis...")
    sniff(filter="tcp", prn=packet_callback, store=False, count=0)