mcpField
T
tcp-ip

tcp-ip

github.com/chatermCloud & DevOps59126 installsUpdated 34w ago
Repository

About tcp-ip

tcp-ip is a network diagnostics skill covering TCP/IP connectivity, routing, ports, and packet inspection. It provides command-based procedures for investigating common network failures.

Key features

  1. 01Connectivity checks with ping
  2. 02Route tracing with traceroute and mtr
  3. 03Interface and route inspection
  4. 04Listening port and connection checks
  5. 05Packet capture with tcpdump

Use cases

  1. 01Diagnosing unreachable hosts
  2. 02Investigating blocked or unavailable ports
  3. 03Tracing connection timeouts
  4. 04Checking DNS resolution failures

Install

Copy the command and run it in a terminal.

$npx skills add https://github.com/chaterm/terminal-skills --skill tcp-ip

After installing, type/tcp-ipin Claude Code to confirm it loaded.

Details

From the project README

TCP/IP 网络诊断

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

Comments

Markdown supported