ip netns tips — authorized network-namespace literacy

Snapshot

Tip checklist (authorized only)

1. Confirm you may run ip netns on the lab host (syllabus box you own or were given access to; iproute2 required).
2. Prefer documenting who / why / ticket before any add/exec/delete write — never manage production netns without change control.
3. Record short factual notes; quote short Evidence (netns name, link labels — never secrets or foreign routes you should not see).
4. Optional: inventory peer → lsns-tips.
5. Optional: enter peer → nsenter-tips.
6. Prefer disposable lab netns names for drills; quote ip netns list / ip netns identify afterward as Evidence.
7. Prefer read-only list / identify for most Evidence binders unless the syllabus asks for add/exec.
8. Stop at literacy — no attack or unauthorized netns-escape cookbooks.

Allowed framing

• Classroom labs reviewing ip netns list / identify / exec on authorized disposable hosts.
• Binding short factual notes as Evidence (netns name/link labels — no secrets).
• Documenting expected vs observed named netns state for authorized inventory notes.
• Comparing ip-netns ↔ lsns / nsenter / unshare peer tip pages under one binder.
• Testing add/del/exec only when the syllabus authorizes that drill on lab resources.

Scope we will not cover

• No crack/pirate/keygen via ip netns.
• No intentional unauthorized netns create/exec/delete against foreign hosts.
• No secret-theft or route/credential harvesting against hosts you do not own.
• No cookbooks that weaken network isolation or plant covert netns without authorization.

Beginner path (authorized only)

1. Obtain one syllabus-approved disposable lab host with iproute2 available.
2. Prefer a throwaway lab netns name before any add drill.
3. With authorization, run ip netns list and (if present) ip netns identify <pid>; quote non-secret netns name labels as Evidence.
4. Optional: peer tip pages above when the syllabus asks.
5. Stop at literacy — no attack or unauthorized netns-management cookbooks.

Practical notes for authorized labs

• ip netns manages named network namespaces under /var/run/netns — keep Evidence labels distinct from generic lsns-tips inventory.
• Pair with nsenter-tips / unshare-tips only for syllabus-approved netns drills on lab hosts.
• Interface/address dumps may embed sensitive topology — never paste secrets into notes or git.
• Prefer documenting netns names the syllabus authorized without dumping full privileged inspect JSON.
• Never commit ip netns dumps with secrets to git — even for labs.

FAQ-aligned refusals (quick)

• Foreign-host netns create/exec/delete → refuse.
• Unauthorized isolation-weaken / covert-netns cookbooks → refuse.
• Attack/credential-theft framing → refuse.

For legal, authorized and educational use only.

FAQ

Sources