dtoro/oikos
1
0
Fork 0
Code Issues Pull Requests Actions 2 Packages Projects Releases Wiki Activity

DNS Phase 2: fix roaming-peer resolution via route distribution

Browse Source 
Root cause of "NetBird won't forward to Technitium" was NOT a nameserver
bug — it was a missing route. The home-lab-dns nameserver group
(-> 192.168.8.2, domain hubris.network) was applied to all peers, but the
192.168.8.0/24 route (home-lab-network resource) was distributed only to
the Services group. Roaming peers (Core: iphone + laptops) had no route to
192.168.8.2, so forwarding silently failed (Networks: -).

Fix: added Core to the home-lab-network resource distribution via the
NetBird API. Roaming peers now get the subnet route + the already-applied
nameserver forwarding -> *.hubris.network resolves off-LAN. Also grants
roaming devices full homelab service access. No CT 107 mesh-join needed
(original Phase 2 hypothesis obsolete).

Docs: corrected dns.md + 107-dns.md root-cause claims. Managed zone kept
as fallback pending Phase 4.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
authentik Default Admin
2026-06-21 15:28:08 +02:00
parent 85457095e4
commit f9f2e8ab5e
2 changed files with 14 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
containers/107-dns.md
View File

@@ -24,12 +24,14 @@ Authoritative split-horizon DNS for `hubris.network` on the LAN/mesh, plus recur
- API: `http://192.168.8.2:5380/api/...` (token via `/api/user/login`). Zone was built via the API.
## Who points here
- **NetBird mesh peers:** resolve via the **NetBird managed DNS zone**, kept in sync *from* this Technitium (see dns-sync below). The `home-lab-dns` nameserver group (`→ 192.168.8.2`) is a thin fallback forwarder.
- **NetBird mesh peers:** resolve `hubris.network` via the `home-lab-dns` nameserver group (`→ 192.168.8.2`, applied to all peers) — now that roaming peers (`Core`) have the `192.168.8.0/24` route (fixed 2026-06-21), this forwarding path works for everyone. The **NetBird managed DNS zone** (kept in sync from this Technitium via dns-sync below) is now a redundant fallback, slated for removal in Phase 4.
- **Homelab DHCP clients:** Technitium's own DHCP scope hands out `192.168.8.2` as the DNS server for `192.168.8.x` leases (see DHCP section below).
- **Plain LAN clients (`192.168.178.x`):** Fritz!Box DHCP still hands out Fritz!Box itself (`192.168.178.1`) as DNS, **but** the Fritz!Box now *forwards* upstream to Technitium — DNSv4 server set to `192.168.8.2` (Internet → Filter → DNS Server, 2026-06-17). So household clients get split-horizon `*.hubris.network` answers via Fritz!Box→Technitium, with **no NetBird dependency**. (This is the change that decoupled the on-prem tier from the mesh — see [dns.md](../infrastructure/dns.md) 2026-06-17.)
## dns-sync (Technitium = authoring source)
`/opt/dns-sync/sync.py` (cron `*/10`, logs `/var/log/dns-sync.log`) reconciles this zone's named A-records → the NetBird managed DNS zone via the NetBird API (`/api/dns/zones/{id}/records`). Token at `/opt/dns-sync/netbird-token` (mode 600; source of truth in sops `secrets/netbird-pat.yaml`). **Edit DNS only here**; the sync propagates to the mesh. It deletes NetBird records absent from Technitium. Tracked: [scripts/dns-sync.py](../scripts/dns-sync.py). *Why this exists:* NetBird won't forward to Technitium for mesh peers (self-IP / nameserver-group quirks), so we sync into the managed zone instead — see [dns.md](../infrastructure/dns.md).
`/opt/dns-sync/sync.py` (cron `*/10`, logs `/var/log/dns-sync.log`) reconciles this zone's named A-records → the NetBird managed DNS zone via the NetBird API (`/api/dns/zones/{id}/records`). Token at `/opt/dns-sync/netbird-token` (mode 600; source of truth in sops `secrets/netbird-pat.yaml`). **Edit DNS only here**; the sync propagates to the mesh. It deletes NetBird records absent from Technitium. Tracked: [scripts/dns-sync.py](../scripts/dns-sync.py).
> **Why this exists (and why it's being retired) — corrected 2026-06-21.** The sync was built on the belief that "NetBird won't forward to Technitium for mesh peers." That was **wrong**: the `home-lab-dns` nameserver group (→ `192.168.8.2`, domain `hubris.network`) was applied to all peers, but the `192.168.8.0/24` route was distributed only to the `Services` group — roaming peers (`Core`) had no route to reach `192.168.8.2`. Adding `Core` to the route distribution fixed forwarding directly. The managed zone + this sync are now redundant and slated for removal in Phase 4. See [dns.md changelog 2026-06-21](../infrastructure/dns.md).
## DHCP