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Analyze the network path with mtr

harmlessNetworkalle
Adjust the values, the command updates live
user@server
mtr -rwc 50 example.com

Sends the given number of probes to every hop on the way to the target and then prints a report with packet loss, average and worst latency. -w prevents long hostnames from being truncated. The report works well as an attachment to a support ticket.

Note: Packet loss at only one intermediate hop is often harmless because routers throttle ICMP. What matters is loss that persists all the way to the target. Package on Debian: mtr-tiny.

Also searched as

  • mtr report packet loss
  • traceroute with packet loss
  • diagnose network latency to server

Related one-liners

All in Network

Capture network traffic on a port with tcpdump

#tcpdump -i any -nn -c 100 port 25
harmlessNetwork

Check HTTP status codes for a list of URLs

$while read -r u; do printf '%s %s\n' "$(curl -o /dev/null -sS -w '%{http_code}' "$u")" "$u"; done < urls.txt
harmlessNetwork

Check server ports from outside with nmap

$nmap -Pn -p 21,22,25,80,110,143,443,465,587,993,995,3306,8443,8880 server.example.com
harmlessNetwork

Count TCP connections by state

$ss -Htan | awk '{print $1}' | sort | uniq -c | sort -rn
harmlessNetwork

Count web server connections per IP address

$ss -Htn state established '( sport = :80 or sport = :443 )' | awk '{print $4}' | rev | cut -d: -f2- | rev | sort | uniq -c | sort -rn | head -20
harmlessNetwork

Find the public IP address of a server

$curl -4 -s https://icanhazip.com
harmlessNetwork

Read first, then run.

The commands on myline.de act directly on servers, files and databases. A wrong path or placeholder can delete data irreversibly or make a server unreachable.

  • All commands are provided without warranty and are not tested on every system.
  • Understand what a command does before running it, and check every placeholder.
  • Make a backup first and, if possible, try it on a test system.
  • You run commands at your own risk. Liability for damages is excluded to the extent permitted by law.