network-info

name	network-info
description	Gather network configuration and connectivity details on Linux including interfaces, IP addresses, routing tables, DNS settings, and listening ports. Use when the user asks about IP configuration, network interfaces, connection issues, DNS resolution, open ports, routing, or network troubleshooting.

Network Information Skill

Explores network configuration and connectivity on Linux systems.

Suggested Workflow

1. Run ./scripts/netinfo.sh for a structured overview of interfaces, IPs, routes, DNS, and listening ports.
2. Check ip addr for interface status and assigned addresses.
3. Verify routing with ip route and DNS with cat /etc/resolv.conf.
4. Inspect listening services with ss -tuln to identify open ports.

Commands Reference

Network Interfaces

• ip addr or ip a - Show all network interfaces and IP addresses
• ip link - Show interface status (up/down)
• cat /sys/class/net/*/address - MAC addresses

Routing

• ip route - Show routing table
• ip route get 8.8.8.8 - Show route to a specific destination

DNS Configuration

• cat /etc/resolv.conf - DNS servers
• cat /etc/hosts - Local host mappings
• systemd-resolve --status - DNS status (systemd systems)

Active Connections

• ss -tuln - Show listening TCP/UDP ports
• ss -tupn - Show established connections with process info
• cat /proc/net/tcp - Raw TCP connection data

Network Statistics

• ip -s link - Interface statistics (bytes, packets, errors)
• cat /proc/net/dev - Network device statistics

Tips

• Use ip commands (modern) over ifconfig/netstat (deprecated)
• The -n flag prevents DNS lookups for faster output
• Check ss -tuln to see what services are listening