我的笔记本电脑出现了一些问题，导致 Ubuntu 20.04 速度变慢。检查 netstat 显示在随机高端口上有多个已建立的保持连接，这些连接源自外部计算机的端口 443。CPU 使用率很高，但找不到正在使用它的内容。我刚刚卸载并重新安装了 chrome，这有帮助。这些连接正常吗？不是 IT 人员，只是感觉有点奇怪。
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State Timer
tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN off (0.00/0/0)
tcp 0 0 127.0.0.53:53 0.0.0.0:* LISTEN off (0.00/0/0)
tcp 0 0 192.168.1.12:53884 104.18.130.236:443 ESTABLISHED keepalive (20.72/0/0)
tcp 0 0 192.168.1.12:53266 104.18.40.222:443 ESTABLISHED keepalive (4.34/0/0)
tcp 0 0 192.168.1.12:55602 151.101.65.181:443 ESTABLISHED keepalive (35.06/0/0)
tcp 0 0 192.168.1.12:45592 23.55.3.87:443 ESTABLISHED keepalive (0.24/0/0)
tcp 0 0 192.168.1.12:33384 172.217.24.34:443 ESTABLISHED keepalive (24.82/0/0)
tcp 0 0 192.168.1.12:50656 142.250.4.188:5228 ESTABLISHED keepalive (37.10/0/0)
tcp 0 0 192.168.1.12:55890 142.250.66.163:443 ESTABLISHED keepalive (20.72/0/0)
tcp 0 0 192.168.1.12:51840 142.251.143.163:443 ESTABLISHED keepalive (2.29/0/0)
tcp 0 0 192.168.1.12:38292 130.211.33.34:443 ESTABLISHED keepalive (2.29/0/0)
tcp 0 0 192.168.1.12:34296 23.55.3.87:443 ESTABLISHED keepalive (0.24/0/0)
tcp 0 0 192.168.1.12:49454 142.251.221.66:443 ESTABLISHED keepalive (4.34/0/0)
tcp 0 0 192.168.1.12:60130 207.65.33.78:443 ESTABLISHED keepalive (30.96/0/0)
tcp 0 0 192.168.1.12:47348 18.67.111.87:443 ESTABLISHED keepalive (41.20/0/0)
tcp 0 0 192.168.1.12:41100 151.101.65.181:443 ESTABLISHED keepalive (33.01/0/0)
tcp 0 0 192.168.1.12:46776 172.217.24.33:443 ESTABLISHED keepalive (6.39/0/0)
tcp 0 0 192.168.1.12:59592 172.217.24.42:443 ESTABLISHED keepalive (4.34/0/6)
tcp 0 0 192.168.1.12:42124 151.101.65.108:443 ESTABLISHED keepalive (30.96/0/0)
tcp 0 0 192.168.1.12:33774 52.223.2.229:443 ESTABLISHED keepalive (24.82/0/0)
tcp 0 0 192.168.1.12:41768 142.251.221.78:443 ESTABLISHED keepalive (0.24/0/0)
tcp 0 0 192.168.1.12:41594 172.217.24.42:443 ESTABLISHED keepalive (20.72/0/0)
tcp 0 0 192.168.1.12:54544 172.217.24.40:443 ESTABLISHED keepalive (16.62/0/0)
tcp 0 0 192.168.1.12:58966 198.252.206.25:443 ESTABLISHED keepalive (22.77/0/0)
tcp 0 0 192.168.1.12:45588 23.55.3.87:443 ESTABLISHED keepalive (0.24/0/0)
tcp 0 0 192.168.1.12:39586 151.101.65.181:443 ESTABLISHED keepalive (35.06/0/0)
tcp 0 0 192.168.1.12:55776 172.64.150.156:443 ESTABLISHED keepalive (18.67/0/0)
tcp 0 0 192.168.1.12:56604 18.239.199.109:443 ESTABLISHED keepalive (30.96/0/0)
tcp 0 0 192.168.1.12:45982 146.75.92.193:443 ESTABLISHED keepalive (16.62/0/0)
tcp 0 0 192.168.1.12:41662 104.18.130.236:443 ESTABLISHED keepalive (24.81/0/0)
tcp 0 0 192.168.1.12:41732 13.224.181.123:443 ESTABLISHED keepalive (28.91/0/0)
tcp 0 0 192.168.1.12:34918 172.217.24.34:443 ESTABLISHED keepalive (18.67/0/0)
tcp 0 0 192.168.1.12:35414 172.217.24.42:443 ESTABLISHED keepalive (12.52/0/0)
tcp 0 0 192.168.1.12:34312 23.55.3.87:443 ESTABLISHED keepalive (2.28/0/0)
tcp 0 0 192.168.1.12:35358 216.239.38.178:443 ESTABLISHED keepalive (20.72/0/0)
tcp 0 0 192.168.1.12:59152 172.217.24.34:443 ESTABLISHED keepalive (43.24/0/0)
tcp 0 0 192.168.1.12:41328 204.79.197.204:443 ESTABLISHED keepalive (4.33/0/0)
tcp 0 0 192.168.1.12:52160 216.239.32.116:443 ESTABLISHED keepalive (30.96/0/0)
tcp 0 0 192.168.1.12:46762 172.217.24.33:443 ESTABLISHED keepalive (6.38/0/0)
tcp 0 0 192.168.1.12:47002 104.18.32.137:443 ESTABLISHED keepalive (20.71/0/0)
tcp6 0 0 ::1:631 :::* LISTEN off (0.00/0/0)
udp 0 0 0.0.0.0:1900 0.0.0.0:* off (0.00/0/0)
udp 0 0 127.0.0.53:53 0.0.0.0:* off (0.00/0/0)
udp 0 0 192.168.1.12:68 192.168.1.1:67 ESTABLISHED off (0.00/0/0)
udp 0 0 0.0.0.0:631 0.0.0.0:* off (0.00/0/0)
udp 0 0 224.0.0.251:5353 0.0.0.0:* off (0.00/0/0)
udp 0 0 224.0.0.251:5353 0.0.0.0:* off (0.00/0/0)
udp 0 0 0.0.0.0:5353 0.0.0.0:* off (0.00/0/0)
udp 0 0 0.0.0.0:58776 0.0.0.0:* off (0.00/0/0)
udp6 0 0 :::1900 :::* off (0.00/0/0)
udp6 0 0 :::56808 :::* off (0.00/0/0)
udp6 0 0 :::5353 :::* off (0.00/0/0)
raw6 0 0 :::58 :::* 7 off (0.00/0/0)
谢谢阅读
答案1
所有这些连接都是从您的 PC 传出到外部 Web 服务器的。尝试找出哪个本地进程发起了这些连接。我猜可能是 Web 浏览器。
sudo netstat -lntp
上述命令将在最后一列显示进程号。
下面是一个输出示例，最后一列的进程号在所有行中都是 6895：
tcp 0 0 10.1.1.111:44248 34.149.100.209:443 ESTABLISHED 6895/firefox-trunk
tcp 0 0 10.1.1.111:53812 34.107.243.93:443 ESTABLISHED 6895/firefox-trunk
tcp 0 0 10.1.1.111:33646 198.252.206.25:443 ESTABLISHED 6895/firefox-trunk
流程详情：
ps -ef | grep 6895
找到这些进程并停止或终止它们。探索这些进程启动的原因和时间。
您可以使用该top命令发现CPU负载过高的真正原因。
sudo top
查找% CPU列中值较高的进程。