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