Continuation Prompt — NetBird Mesh / Local LLM Remote Access

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I'm continuing my local infrastructure project. The VPN mesh between my desktop, laptop, and phone is built and mostly working — this thread picked up mid-way through fixing one specific bug, plus a few smaller things left open.

Working style (important)

One thing at a time, confirmation before moving on.
I type every command myself; explain each step, wait for my output/error/"done".
No unsolicited finished scripts or configs — I want to understand and reproduce each step.
Architecture/structural decisions: lay out options + trade-offs first, decide together, don't just implement.
If I put a "?" before a question, I want a short answer only.
English throughout (technical topic).
End meaningful steps with a short "Done / Learned" bullet-journal note.
Check current info/versions before recommending specific tools when it matters — this space moves fast.

Devices and identities

Device	Hostname	NetBird IP	Notes
Desktop	Heimdall-home	`100.105.210.21`	EndeavourOS, user `heimdall`, runs llama-swap
Laptop	heymdall-750xed	`100.105.247.153`	EndeavourOS, user `heymdall`, runs Open WebUI
Phone	—	—	Joined mesh, not yet pointed at anything

Home LAN subnet: 192.168.178.0/24
Desktop's Docker bridge: 172.17.0.0/16, gateway 172.17.0.1

Fully working / confirmed

NetBird Cloud mesh — all three devices joined, dashboard shows 3 peers, peer-to-peer connectivity verified (desktop ↔ laptop ping test, direct path not relayed).
llama-swap on the desktop — running as a proper systemd service (llama-swap.service, Restart=on-failure, enabled for boot). Old manually-run process was killed cleanly; no port conflict.
UFW on the desktop — installed, default-deny incoming / default-allow outgoing. Port 8080 (llama-swap) restricted to the wt0 (NetBird) interface only — verified from the laptop: mesh access works, raw LAN access is blocked (hangs/times out, doesn't refuse instantly).
Desktop sleep prevention — confirmed KDE PowerDevil and systemd-logind both defaulted to no idle action; additionally hard-masked sleep.target, suspend.target, hibernate.target, hybrid-sleep.target at the systemd level as a belt-and-suspenders guarantee.
Open WebUI on the laptop (Docker) — installed, connected to the desktop's llama-swap via http://100.105.210.21:8080/v1, all configured models (daily, coder-fim, architect, etc.) tested and confirmed working with real inference, not just model-list loading.
Cline on the laptop — pointed at the desktop's llama-swap, confirmed working.
Phone — added to the NetBird mesh, shows as a connected peer. Not yet pointed at anything (see below).

🔴 Immediate unresolved issue (where this thread left off)

The desktop's own Open WebUI container can't reach the desktop's own llama-swap. Its connection is configured as host.docker.internal:8080.

Root cause confirmed via sudo journalctl -k | grep -i block: UFW is blocking the request. host.docker.internal resolves to the Docker bridge gateway (172.17.0.1), so the request arrives on the docker0 interface — which was never given an allow rule (Step 4 in the setup guide only opened wt0).

Fix identified but not yet confirmed executed/tested:

sudo ufw allow in on docker0 to any port 8080 proto tcp

Next action: have the user run that command, then send a real test message from the desktop's Open WebUI, then confirm with sudo journalctl -u llama-swap -n 5 --no-pager that a fresh request appears from the container's Docker IP (172.17.0.2).

Other open items (not urgent, in rough priority order)

Laptop's Open WebUI (port 3000) is still bound to all interfaces (0.0.0.0), reachable on whatever network the laptop happens to be connected to — not just the mesh. A fix was proposed (rebind the Docker port publish to the laptop's specific NetBird IP, -p 100.105.247.153:3000:8080) but never executed — the conversation moved to the desktop bug above before this was actioned.
Phone → Open WebUI — not yet tested end to end. Depends on resolving item 1 first (decide whether phone should reach the laptop's Open WebUI via its LAN IP or mesh IP going forward).
SSH remote access to the desktop — deliberately deferred by the user ("when I have time to set up correctly"). Current state: SSH daemon is running on the desktop, but UFW has no rule for port 22 at all, so it's unreachable remotely (local keyboard access only). No key-based auth set up yet either — would need a new ed25519 keypair on the laptop (per the user's per-device key policy) plus a UFW rule, likely scoped to the home LAN subnet specifically (not just wt0) so it still works as a fallback if NetBird itself is ever the thing that's broken.
Docker's general iptables/UFW interaction — flagged as a topic worth understanding properly later (the DOCKER-USER chain approach), since it will likely recur with future Dockerized services. Not blocking anything right now — the desktop/laptop specific cases so far have had narrower fixes that didn't require it.
Vault entries — three candidates were identified and offered to the user, but no response yet on which (if any) to draft:
- Kernel/module mismatch after an unrebooted update (general Arch lesson)
- Instant refusal vs. hang/timeout as a firewall diagnostic signal
- Docker bypassing UFW for published ports (the incoming case, distinct from the docker0-outbound case solved in this session)

Reference: full setup as documented

A companion tutorial-style document (README-netbird-mesh-llm-setup.md) captures every step taken so far in reproducible form, including the two non-obvious pitfalls hit along the way (kernel/module mismatch, and the docker0 UFW gap). Bring that in if a fresh recreation or a review of exact commands is needed.

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