About

Imported from chaterm/terminal-skills (network/tcp-ip/SKILL.md). Install upstream with npx skills add chaterm/terminal-skills --skill tcp-ip. Copyright stays with the author.

TCP/IP 网络诊断

Name: tcp-ip
Author: chaterm

概述

TCP/IP 协议栈相关的网络诊断、连通性测试、端口排查等技能。

连通性测试

# Ping 测试
ping -c 4 hostname
ping -i 0.2 hostname              # 间隔 0.2 秒

# 路由追踪
traceroute hostname
traceroute -n hostname            # 不解析域名
mtr hostname                      # 实时追踪

# 端口连通性
telnet hostname 80
nc -zv hostname 80
nc -zv hostname 80-100            # 端口范围

网络配置

# 查看网络接口
ip addr
ip link show
ifconfig                          # 传统命令

# 查看路由表
ip route
route -n
netstat -rn

# 查看 ARP 表
ip neigh
arp -a

# DNS 查询
nslookup hostname
dig hostname
dig +short hostname
host hostname

端口与连接

# 查看监听端口
ss -tlnp                          # TCP 监听
ss -ulnp                          # UDP 监听
netstat -tlnp

# 查看所有连接
ss -tanp
netstat -anp

# 查看特定端口
ss -tlnp | grep :80
lsof -i :80

# 连接统计
ss -s
netstat -s

抓包分析

# tcpdump 基础
tcpdump -i eth0
tcpdump -i any port 80
tcpdump -i eth0 host 192.168.1.1
tcpdump -i eth0 -w capture.pcap

# 常用过滤
tcpdump -i eth0 'tcp port 80'
tcpdump -i eth0 'host 10.0.0.1 and port 443'
tcpdump -i eth0 'tcp[tcpflags] & tcp-syn != 0'

# 读取抓包文件
tcpdump -r capture.pcap
tcpdump -r capture.pcap -A        # 显示 ASCII

常见场景

场景 1：排查网络不通

# 1. 检查本地网络
ip addr
ip route

# 2. 测试网关连通性
ping gateway_ip

# 3. 测试目标连通性
ping target_ip
traceroute target_ip

# 4. 检查 DNS
nslookup target_hostname

场景 2：排查端口不通

# 1. 检查服务是否监听
ss -tlnp | grep :port

# 2. 检查防火墙
iptables -L -n
firewall-cmd --list-all

# 3. 从远程测试
nc -zv target_ip port

场景 3：排查连接超时

# 1. 检查网络延迟
ping -c 10 target

# 2. 检查路由
mtr target

# 3. 抓包分析
tcpdump -i eth0 host target -w debug.pcap

故障排查

问题	排查方法
网络不通	`ping`, `traceroute`, 检查路由
DNS 解析失败	`nslookup`, `dig`, 检查 /etc/resolv.conf
端口不通	`ss -tlnp`, 检查防火墙
连接超时	`mtr`, `tcpdump` 抓包分析
连接被拒绝	检查服务状态、端口监听

Use it

Copy one of these into your project. Installing also returns the manifest and these snippets.

yaml

targets:
  - https://api.opensmartroute.ai/api/v1/registry/chaterm-terminal-skills-tcp-ip/manifest   # or paste the manifest below

Manifest

An Open Capability Manifest: the router reads it to know what this does, what it costs and when to pick it.

chaterm-terminal-skills-tcp-ip.ocm.jsonjson

{
  "ocm": "1",
  "id": "chaterm-terminal-skills-tcp-ip",
  "kind": "skill",
  "name": "tcp-ip",
  "description": "TCP/IP 网络诊断与排查",
  "publisher": "chaterm",
  "version": "1.0.0",
  "capabilities": {
    "domains": [
      "general"
    ],
    "tags": [
      "skill-md",
      "networking",
      "tcp",
      "ip",
      "diagnosis",
      "skills-sh"
    ],
    "languages": [
      "en"
    ]
  },
  "quality_prior": 0.6,
  "examples": [
    "TCP/IP 网络诊断与排查"
  ],
  "primary": false,
  "metadata": {
    "source": {
      "provider": "skills.sh",
      "repository": "https://github.com/chaterm/terminal-skills",
      "path": "network/tcp-ip/SKILL.md",
      "ref": "HEAD",
      "url": "https://github.com/chaterm/terminal-skills/blob/HEAD/network/tcp-ip/SKILL.md",
      "key": "chaterm/terminal-skills/network/tcp-ip/SKILL.md"
    }
  },
  "instructions": "# TCP/IP 网络诊断\n\n## 概述\nTCP/IP 协议栈相关的网络诊断、连通性测试、端口排查等技能。\n\n## 连通性测试\n\n```bash\n# Ping 测试\nping -c 4 hostname\nping -i 0.2 hostname              # 间隔 0.2 秒\n\n# 路由追踪\ntraceroute hostname\ntraceroute -n hostname            # 不解析域名\nmtr hostname                      # 实时追踪\n\n# 端口连通性\ntelnet hostname 80\nnc -zv hostname 80\nnc -zv hostname 80-100            # 端口范围\n```\n\n## 网络配置\n\n```bash\n# 查看网络接口\nip addr\nip link show\nifconfig                          # 传统命令\n\n# 查看路由表\nip route\nroute -n\nnetstat -rn\n\n# 查看 ARP 表\nip neigh\narp -a\n\n# DNS 查询\nnslookup hostname\ndig hostname\ndig +short hostname\nhost hostname\n```\n\n## 端口与连接\n\n```b",
  "cost": {
    "context_tokens": 463
  }
}

Fetch it by URL: GET /api/v1/registry/chaterm-terminal-skills-tcp-ip/manifest?version=1.0.0

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