ip addr (replaces ifconfig) |
Network interfaces and IPs |
ip route |
Routing table |
ss -tlnp (replaces netstat -tlnp) |
TCP listening ports with process |
ss -tnp state established |
Established TCP connections |
ping <host> |
ICMP reachability |
traceroute <host> / mtr <host> |
Path to destination |
dig <name> |
DNS lookup |
dig +trace <name> |
Show full DNS resolution path |
nslookup <name> |
DNS lookup (older) |
host <name> |
Simple DNS lookup |
curl -v <url> |
HTTP request with verbose output |
curl -I <url> |
Headers only |
curl -w "%{http_code}\n" -o /dev/null -s <url> |
Just the status code |
tcpdump -i any port 443 |
Packet capture |
tcpdump -i any host 1.2.3.4 -w capture.pcap |
Capture to file for Wireshark |