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
IPv6 security here is a list for a network you run: filtering of source addresses you do not originate, no administration from the world, and router advertisements only from the router you chose. It is not an attack guide and not a certification.
Extension headers and a wide ICMPv6 filter are easy to get wrong. Necessary neighbor-discovery messages still have to pass on the link. Write the filter you mean. Do not copy a forum list that drops the link.
One item this hour. The rest stay as named gaps. A secret in a sample config is prompt-for-this, not a password you save.
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.
- Confirm the network is yours.
- Pick one gap.
- Write the filter or the advertisement source.
- Keep neighbor discovery working on the link.
- Do not call the list a certification.
- Stop after one item.
Mistakes that outlive the command
IPv6 Security Best Practices goes wrong in a small set of ways. The list is here so the ticket can forbid them before the window.
- A forum blocklist pasted unread.
- ICMPv6 dropped until the link dies.
- Management open to the world.
- Calling the checklist an audit.
- A sample password left in the note.
Decisions to write down
One decision for IPv6 Security Best Practices: The network is yours. One gap is chosen. Neighbor discovery still has a path. Management is not open to the world. And this is not a certification.
Checks before you call it done
Confirm this before you call the change done: One gap is written. The change matches that gap. The link still resolves a neighbor. No sample secret was saved. And the other gaps are named, not started. If one of those fails, stop.
Before you leave the device
IPv6 Security Best Practices 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
This guide does not name a browser tool. The pillar it belongs to links the calculators for the neighbouring work.
Related pillar guides
More in this cluster
The pillar for this page, and the next published pages filed with it.