Router will decrement TTL value within IP packet.
“ping” can be used to simulate how ICMP works in more complex tool such as “mtr”, “traceroute”.
Please try increasing ttl-value against any target machine is ICMP is enabled along the route.
- on unix/linux: ping -t <number> target-ip
- on windows: ping -i target-ip
mtr: ICMP by default
mtr -u: use UDP
mtr -n : display numeric IP
mtr -r: report
(TCP ) tcptraceroute http://www.google.com 443
ping test with incremental TTL
We can conduct an incremental testing with one ICMP packet each time:
For the curious, can look up http://www.binbert.com/blog/2009/12/default-time-to-live-ttl-values/ to take a guess what the remote system might be.