Use a regular user account to inspect IPv6 path and Path MTU to 2001:db8::20.
Do not perform reverse DNS.
Which command is appropriate?
tracepath -6 -n traces IPv6 and reports Path MTU while suppressing name resolution.
Detailed explanation
tracepath -4 -n 2001:db8::20Incorrect. -4 forces IPv4.
Incorrect. -4 forces IPv4.
tracepath -6 -n 2001:db8::20Correct. It traces the IPv6 path and shows numeric Path MTU data.
Correct. It traces the IPv6 path and shows numeric Path MTU data.
ss -6 -n 2001:db8::20Incorrect. ss lists local sockets, not a path or Path MTU.
Incorrect. ss lists local sockets, not a path or Path MTU.
route -6 -n 2001:db8::20Incorrect. route handles the local table and does not probe every hop.
Incorrect. route handles the local table and does not probe every hop.
Try it yourself
An example you can run in a temporary verification environment.
tracepath -h 2>&1 | sed -n '1,10p'Expected result
-4、-6、-nなどを含むtracepathの使用方法Key points
- -6 selects IPv6
- -n suppresses reverse lookup
- It reports Path MTU
Notes
- Environment: iputils tracepath help / 外部通信なし
- Command output formatting can vary slightly by distribution or tool version.
- Run the example in a temporary directory or process when possible.
Foundation review
Read the scope first
Check whether the command acts on the current shell, a new process, an existing process, or a file.
Verify the observable result
Use the supplied command and compare the output with the expected result.