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Homelab Docs

Networking basics

Terminal window
ip addr OR ip a                    # Show IP addresses (& shows IP addresses assigned to each interfaces)
ip link                            # Show network interfaces (i.e eth0, wlan0, lo, etc)
ip route                           # Show where the packets are going (default gateway, DHCP, CIDR notation)
ping -c 4 google.com               # Test connectivity (4 packets)
curl -I https://example.com        # Test web connectivity, show headers
wget https://example.com/file.txt  # Download file
ss -tuln                           # Show listening ports (replaces netstat)

Commands learnt from troubleshooting router:

Section titled “Commands learnt from troubleshooting router:”
Terminal window
nmcli = network manager in (cli) terminal


nmcli device status                                     # Show all interfaces & their connection states
nmcli connection show                                   # Lists all saved connection profiles
nmcli connection down/up                                # De/activates a connection
nmcli connection modify "NAME" ipv4.route-metric 200    # Sets routing priority. Higher = less preferred
nmcli connection modify "NAME" \
    ipv4.method manual \
    ipv4.address "192.168.1.10/24" \
    ipv4.gateway "192.168.1.1" # Sets static IP gateway