tcp-ip

Name: tcp-ip
Author: chaterm

105installs12forks

How to install tcp-ip?

chaterm/terminal-skills/tcp-ip

$npx -y skills add chaterm/terminal-skills --skill tcp-ip

Installs into the current project.

Summary

TCP/IP 网络诊断与排查

Files · 1

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SKILL.md

1	# TCP/IP 网络诊断
2
3	## 概述
4	TCP/IP 协议栈相关的网络诊断、连通性测试、端口排查等技能。
5
6	## 连通性测试
7
8	```bash
9	# Ping 测试
10	ping -c 4 hostname
11	ping -i 0.2 hostname # 间隔 0.2 秒
12
13	# 路由追踪
14	traceroute hostname
15	traceroute -n hostname # 不解析域名
16	mtr hostname # 实时追踪
17
18	# 端口连通性
19	telnet hostname 80
20	nc -zv hostname 80
21	nc -zv hostname 80-100 # 端口范围
22	```
23
24	## 网络配置
25
26	```bash
27	# 查看网络接口
28	ip addr
29	ip link show
30	ifconfig # 传统命令
31
32	# 查看路由表
33	ip route
34	route -n
35	netstat -rn
36
37	# 查看 ARP 表
38	ip neigh
39	arp -a
40
41	# DNS 查询
42	nslookup hostname
43	dig hostname
44	dig +short hostname
45	host hostname
46	```
47
48	## 端口与连接
49
50	```bash
51	# 查看监听端口
52	ss -tlnp # TCP 监听
53	ss -ulnp # UDP 监听
54	netstat -tlnp
55
56	# 查看所有连接
57	ss -tanp
58	netstat -anp
59
60	# 查看特定端口
61	ss -tlnp \| grep :80
62	lsof -i :80
63
64	# 连接统计
65	ss -s
66	netstat -s
67	```
68
69	## 抓包分析
70
71	```bash
72	# tcpdump 基础
73	tcpdump -i eth0
74	tcpdump -i any port 80
75	tcpdump -i eth0 host 192.168.1.1
76	tcpdump -i eth0 -w capture.pcap
77
78	# 常用过滤
79	tcpdump -i eth0 'tcp port 80'
80	tcpdump -i eth0 'host 10.0.0.1 and port 443'
81	tcpdump -i eth0 'tcp[tcpflags] & tcp-syn != 0'
82
83	# 读取抓包文件
84	tcpdump -r capture.pcap
85	tcpdump -r capture.pcap -A # 显示 ASCII
86	```
87
88	## 常见场景
89
90	### 场景 1：排查网络不通
91	```bash
92	# 1. 检查本地网络
93	ip addr
94	ip route
95
96	# 2. 测试网关连通性
97	ping gateway_ip
98
99	# 3. 测试目标连通性
100	ping target_ip
101	traceroute target_ip
102
103	# 4. 检查 DNS
104	nslookup target_hostname
105	```
106
107	### 场景 2：排查端口不通
108	```bash
109	# 1. 检查服务是否监听
110	ss -tlnp \| grep :port
111
112	# 2. 检查防火墙
113	iptables -L -n
114	firewall-cmd --list-all
115
116	# 3. 从远程测试
117	nc -zv target_ip port
118	```
119
120	### 场景 3：排查连接超时
121	```bash
122	# 1. 检查网络延迟
123	ping -c 10 target
124
125	# 2. 检查路由
126	mtr target
127
128	# 3. 抓包分析
129	tcpdump -i eth0 host target -w debug.pcap
130	```
131
132	## 故障排查
133
134	\| 问题 \| 排查方法 \|
135	\|------\|----------\|
136	\| 网络不通 \| `ping`, `traceroute`, 检查路由 \|
137	\| DNS 解析失败 \| `nslookup`, `dig`, 检查 /etc/resolv.conf \|
138	\| 端口不通 \| `ss -tlnp`, 检查防火墙 \|
139	\| 连接超时 \| `mtr`, `tcpdump` 抓包分析 \|
140	\| 连接被拒绝 \| 检查服务状态、端口监听 \|

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tcp-ip

105installs12forks

View on GitHub

How to install tcp-ip?

chaterm/terminal-skills/tcp-ip

$npx -y skills add chaterm/terminal-skills --skill tcp-ip

Installs into the current project.

Summary

TCP/IP 网络诊断与排查

Files · 1

View on GitHub

SKILL.md

1	# TCP/IP 网络诊断
2
3	## 概述
4	TCP/IP 协议栈相关的网络诊断、连通性测试、端口排查等技能。
5
6	## 连通性测试
7
8	```bash
9	# Ping 测试
10	ping -c 4 hostname
11	ping -i 0.2 hostname # 间隔 0.2 秒
12
13	# 路由追踪
14	traceroute hostname
15	traceroute -n hostname # 不解析域名
16	mtr hostname # 实时追踪
17
18	# 端口连通性
19	telnet hostname 80
20	nc -zv hostname 80
21	nc -zv hostname 80-100 # 端口范围
22	```
23
24	## 网络配置
25
26	```bash
27	# 查看网络接口
28	ip addr
29	ip link show
30	ifconfig # 传统命令
31
32	# 查看路由表
33	ip route
34	route -n
35	netstat -rn
36
37	# 查看 ARP 表
38	ip neigh
39	arp -a
40
41	# DNS 查询
42	nslookup hostname
43	dig hostname
44	dig +short hostname
45	host hostname
46	```
47
48	## 端口与连接
49
50	```bash
51	# 查看监听端口
52	ss -tlnp # TCP 监听
53	ss -ulnp # UDP 监听
54	netstat -tlnp
55
56	# 查看所有连接
57	ss -tanp
58	netstat -anp
59
60	# 查看特定端口
61	ss -tlnp \| grep :80
62	lsof -i :80
63
64	# 连接统计
65	ss -s
66	netstat -s
67	```
68
69	## 抓包分析
70
71	```bash
72	# tcpdump 基础
73	tcpdump -i eth0
74	tcpdump -i any port 80
75	tcpdump -i eth0 host 192.168.1.1
76	tcpdump -i eth0 -w capture.pcap
77
78	# 常用过滤
79	tcpdump -i eth0 'tcp port 80'
80	tcpdump -i eth0 'host 10.0.0.1 and port 443'
81	tcpdump -i eth0 'tcp[tcpflags] & tcp-syn != 0'
82
83	# 读取抓包文件
84	tcpdump -r capture.pcap
85	tcpdump -r capture.pcap -A # 显示 ASCII
86	```
87
88	## 常见场景
89
90	### 场景 1：排查网络不通
91	```bash
92	# 1. 检查本地网络
93	ip addr
94	ip route
95
96	# 2. 测试网关连通性
97	ping gateway_ip
98
99	# 3. 测试目标连通性
100	ping target_ip
101	traceroute target_ip
102
103	# 4. 检查 DNS
104	nslookup target_hostname
105	```
106
107	### 场景 2：排查端口不通
108	```bash
109	# 1. 检查服务是否监听
110	ss -tlnp \| grep :port
111
112	# 2. 检查防火墙
113	iptables -L -n
114	firewall-cmd --list-all
115
116	# 3. 从远程测试
117	nc -zv target_ip port
118	```
119
120	### 场景 3：排查连接超时
121	```bash
122	# 1. 检查网络延迟
123	ping -c 10 target
124
125	# 2. 检查路由
126	mtr target
127
128	# 3. 抓包分析
129	tcpdump -i eth0 host target -w debug.pcap
130	```
131
132	## 故障排查
133
134	\| 问题 \| 排查方法 \|
135	\|------\|----------\|
136	\| 网络不通 \| `ping`, `traceroute`, 检查路由 \|
137	\| DNS 解析失败 \| `nslookup`, `dig`, 检查 /etc/resolv.conf \|
138	\| 端口不通 \| `ss -tlnp`, 检查防火墙 \|
139	\| 连接超时 \| `mtr`, `tcpdump` 抓包分析 \|
140	\| 连接被拒绝 \| 检查服务状态、端口监听 \|

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