network-diagnostics

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For network troubleshooting:

MTU Issues (common in WSL)
- Check current MTU: ip link show
- Test different MTU: sudo ip link set dev eth0 mtu 1350
- Common WSL MTU: 1300-1400
DNS Resolution
- Check /etc/resolv.conf
- Test with: dig google.com, nslookup google.com
- Try different DNS: 8.8.8.8, 1.1.1.1
Connectivity Tests
- Ping gateway: ip route | grep default
- Traceroute to destination
- Test ports: nc -zv host port, telnet host port
Firewall/Routing
- Check iptables: sudo iptables -L
- Review routes: ip route show
- WSL: Check Windows Firewall
Service Status
- Verify service is running
- Check listening ports: ss -tlnp, netstat -tlnp

MTU问题（WSL中常见）
- 检查当前MTU：ip link show
- 测试不同MTU值：sudo ip link set dev eth0 mtu 1350
- WSL常用MTU范围：1300-1400
DNS解析
- 查看/etc/resolv.conf文件
- 使用以下命令测试：dig google.com、nslookup google.com
- 尝试更换DNS服务器：8.8.8.8、1.1.1.1
连通性测试
- ping网关：ip route | grep default
- 追踪到目标地址的路由：traceroute
- 测试端口：nc -zv host port、telnet host port
防火墙/路由配置
- 查看iptables规则：sudo iptables -L
- 查看路由表：ip route show
- WSL环境：检查Windows防火墙设置
服务状态检查
- 验证服务是否运行
- 查看监听端口：ss -tlnp、netstat -tlnp

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