Network Information Skill

Use this skill to explore network configuration and connectivity on Linux systems.

Quick Start

Run the included script for a network overview:

./scripts/netinfo.sh

Manual Commands

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