My implementation of traceroute, a tool for displaying route and transit delays between nodes in IP network.

This traceroute sends 3 ICMP Echo Request per each TTL (TTLs in range from 1 to 30) and waits 1 second for reply (Time Exceeded or ICMP Echo Reply, which ends the loop).

Answers which come within 1 second are displayed as IP address and latency.

First, compile by running:

$ make

then get some IP:

$ host -t a google.com
google.com has address 216.58.209.78

and finally:

$ sudo ./traceroute 216.58.209.78
[...]
5. 195.149.232.200 195.149.232.200  30.3 ms  33.7 ms
6. 188.47.253.234  48.6 ms
7. 72.14.197.128  47.6 ms
8. 108.170.250.209  216.1 ms
9. 209.85.244.67 209.85.244.67  25.3 ms  34.3 ms
10. 216.58.209.78  43.1 ms

You have to run it as root because using ICMP requires raw sockets. Regular traceroute with -I option (use ICMP instead of UDP) also requires root privileges.