Network diagnostics

Cheat sheet

• ping -c4 gateway L2/L3: is the gateway reachable
• ping -c4 8.8.8.8 L3: connectivity to the internet
• mtr -rwc 10 host path + loss (a report)
• traceroute -T -p 443 host trace over a TCP port (when ICMP is blocked)
• getent hosts name DNS
• nc -zv host port the destination port
• ip route get 8.8.8.8 which route it would take