Linux 统计主机网络连接数

最新推荐文章于 2025-05-16 17:00:32 发布

原创最新推荐文章于 2025-05-16 17:00:32 发布 · 908 阅读

0 ·

CC 4.0 BY-SA版权

无

文章标签：

#linux #网络 #运维

云计算同时被 3 个专栏收录

196 篇文章

订阅专栏

linux

94 篇文章

订阅专栏

k8s

31 篇文章

订阅专栏

本文档展示了主机的网络连接状态，通过`netstat`命令分析了TCP连接的分布，包括不同IP地址和链接状态的统计。同时，提供了最近的系统日志，日志中涉及网络设备进入 promiscuous 和 forwarding 模式，以及网络接口的状态变化。

文章目录

netstat -n | awk '/^tcp/ {n=split($(NF-1),array,":");if(n<=2)++S[array[(1)]];else++S[array[(4)]];++s[$NF];++N} END {for(a in S){printf("%-20s %s\n", a, S[a]);++I}printf("%-20s %s\n","TOTAL_IP",I);for(a in s) printf("%-20s %s\n",a, s[a]);printf("%-20s %s\n","TOTAL_LINK",N);}'

[root@master ~]#netstat -n | awk '/^tcp/ {n=split($(NF-1),array,":");if(n<=2)++S[array[(1)]];else++S[array[(4)]];++s[$NF];++N} END {for(a in S){printf("%-20s %s\n", a, S[a]);++I}printf("%-20s %s\n","TOTAL_IP",I);for(a in s) printf("%-20s %s\n",a, s[a]);printf("%-20s %s\n","TOTAL_LINK",N);}'
42334                1
6443                 1
192.168.10.1         1
192.168.10.65        16
192.168.10.66        3
192.168.10.67        3
127.0.0.1            161
10.96.0.1            1
10.244.0.10          1
10.244.0.8           1
TOTAL_IP             10
ESTABLISHED          183
TIME_WAIT            6
TOTAL_LINK           189

观察主机系统日志

[root@master ~]#dmesg -T  | tail -n 10
[Tue Jul 12 15:04:05 2022] device vetha2622729 entered promiscuous mode
[Tue Jul 12 15:04:05 2022] cni0: port 2(vetha2622729) entered blocking state
[Tue Jul 12 15:04:05 2022] cni0: port 2(vetha2622729) entered forwarding state
[Tue Jul 12 15:04:05 2022] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[Tue Jul 12 15:04:05 2022] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[Tue Jul 12 15:04:05 2022] cni0: port 3(veth9515c149) entered blocking state
[Tue Jul 12 15:04:05 2022] cni0: port 3(veth9515c149) entered disabled state
[Tue Jul 12 15:04:05 2022] device veth9515c149 entered promiscuous mode
[Tue Jul 12 15:04:05 2022] cni0: port 3(veth9515c149) entered blocking state
[Tue Jul 12 15:04:05 2022] cni0: port 3(veth9515c149) entered forwarding state