This is an original planning guide. It is not a vendor manual, an official standard, or legal advice. Example addresses use documentation ranges. Review every command before you paste it.
What this hour is for
A connectivity test answers whether one name or one address answers. The tools on this page check a target you type. The target is a host or a site you operate, or a public name you are allowed to look up as a single check. It is not a range.
Failure has a short list: no prefix, no route, a firewall that drops the version, or a name that has no AAAA. Write which one the result supports. Do not open a rule to the world to see the test turn green.
A website readiness check is still one name. It does not crawl a company and it does not tell you to attack a missing header.
The change you can finish
Apply nothing during the writing of the note. When the lab window opens, it is one change on the device named in the ticket. Read the draft, then the device, then decide.
Rollback is the file or the revision you saved first. You do not invent a rollback after the only copy is gone.
- Name one host you administer, or one public name.
- Run one test.
- Write prefix, route, filter, or DNS.
- Do not scan a range.
- Do not open 0.0.0.0/0 or the IPv6 equivalent to force a pass.
- Stop.
Mistakes that outlive the command
How to Test IPv6 Connectivity goes wrong in a small set of ways. The list is here so the ticket can forbid them before the window.
- A range scan.
- A rule opened to the world as the test.
- Blaming the host before the prefix exists.
- Treating a single lookup as an audit of a company.
Decisions to write down
One decision for How to Test IPv6 Connectivity: The target is one name. The result names a cause. No range was scanned. No any-source rule was added. And the next change has its own ticket.
Checks before you call it done
Confirm this before you call the change done: One target is written. One result is written. No scan occurred. No wide rule was added. And the window is closed. If one of those fails, stop.
Before you leave the device
How to Test IPv6 Connectivity ends when the hostname on the device matches the hostname in the ticket. If it does not, you are on the wrong box. Stop. A command that succeeded on the wrong box is not progress.
The draft stays a draft until a person has read the names in it. A generator does not log into the device and does not know which interface is the uplink. You delete a line that names a device, a zone, or a prefix you did not write down.
0.0.0.0/0 is not kept because a sample included it. A source you can say is the source you keep. 192.0.2.0/24, 198.51.100.0/24, 203.0.113.0/24, and 2001:db8::/32 are documentation. They belong in the note. They are not prefixes you type onto a production device because they appeared in a draft.
prompt-for-this is a reminder that a secret is missing. It is not a password, a key, a community string, or a pre-shared key you save in the ticket or in git. The real secret stays in the store.
One change is the window. A VLAN and a routing protocol and a VPN do not share it. If two things move and the result is wrong, you will not know which one did it. The next feature waits for its own page.
If the same step fails twice, stop for the day. The failure is the result. Adding a forum command beside a half-applied config produces a device nobody can rebuild. Restore the copy you took first.
A second person reads the device name and the change aloud. If they cannot find them in the ticket, the note is not done. Silence is not agreement. Then leave the device alone.
This page is a planning guide. It is not a vendor manual, not an official standard, and not a permission to touch a network you do not administer. The pillar guide owns the wider design. This page owns one lab proof.
Tools for this guide
These tools run in the browser on this site. They do not log into your machines.
Related pillar guides
More in this cluster
The pillar for this page, and the next published pages filed with it.