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network: retire Slate AX; add SODOLA switch migration plan and network topology doc

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- infrastructure/network.md: permanent topology reference — VLAN 1 (main LAN)
  + VLAN 10 (homelab 192.168.8.0/24), Fritz!Box 7590 as VLAN router,
  SODOLA 5-Port 2.5Gbit as homelab switch
- plans/2026-06-01-slate-ax-to-sodola-migration.md: full migration runbook
  (pre-flight, Fritz!Box second-network config, SODOLA VLAN table, cutover
  procedure, verification commands). Gateway 192.168.8.1 is unchanged —
  no LXC/VM config edits needed. Fritz!Box DHCP for VLAN 10 hands out
  192.168.8.2 (Technitium CT 107) as DNS, closing the outstanding item in dns.md.
- plans/index.md: establishes plans/ convention (Planned → In Progress → Done)
- CONTRIBUTING.md: plan page template + linking discipline for plans

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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# 2026-06-01 — Slate AX → SODOLA Migration
**Status:** Planned
**Hardware:** SODOLA 5-Port 2.5Gbit Managed Switch replacing GL.iNet Slate AX
**Router:** Fritz!Box 7590
## Goal
Remove the Slate AX sub-router. It adds double-NAT, double port-forward complexity, and a second DHCP/gateway hop. Replace with the SODOLA switch so Proxmox and homelab devices attach directly to the Fritz!Box—without changing any of their IPs.
## Current topology
```
ISP
└── Fritz!Box 7590 (192.168.178.1)
└── GL.iNet Slate AX WAN: 192.168.178.x LAN: 192.168.8.1 [NAT]
├── hubris (Proxmox) 192.168.8.77
├── + all 16 LXCs on vmbr0 bridged to the same subnet
└── other homelab devices
```
## Target topology
```
ISP
└── Fritz!Box 7590
├── VLAN 1 192.168.178.0/24 (main LAN — laptops, phones)
└── VLAN 10 192.168.8.0/24 gateway 192.168.8.1 (homelab, no NAT)
│
└── SODOLA 5-Port 2.5Gbit
├── Port 1 uplink → Fritz!Box LAN port
├── Port 2 hubris (Proxmox) 192.168.8.77
├── Port 3 [homelab device]
├── Port 4 [homelab device]
└── Port 5 spare
```
Fritz!Box takes over `192.168.8.1` — the same gateway IP the Slate AX used. No static IPs or gateway entries change on any LXC or VM.
See [network architecture](../infrastructure/network.md) for the permanent topology reference.
## Pre-flight checklist
- [ ] Note Slate AX gateway IP on the homelab subnet (expected `192.168.8.1`)
- [ ] Note Slate AX upstream DNS setting (what it forwards to)
- [ ] List all port forwards currently on the Slate AX → move these to Fritz!Box
- [ ] List all port forwards on Fritz!Box that point at the Slate AX WAN IP → collapse these into direct homelab-IP rules
- [ ] Confirm Fritz!OS version supports "second IP network" (Fritz!OS 7.x required)
- [ ] SSH into hubris: verify `grep gateway /etc/network/interfaces` → `192.168.8.1`
- [ ] SODOLA web UI accessible and ports configurable before physical move
## Fritz!Box configuration
**Path:** Home Network → Network → Network Settings → IPv4 Addresses → Add IP network
| Field | Value |
|---|---|
| IP address | `192.168.8.1` |
| Subnet mask | `255.255.255.0` |
| DHCP range | `192.168.8.100 – 192.168.8.240` |
| Assign to | LAN port that connects to SODOLA |
| Network isolation | Enabled (blocks main LAN from initiating into homelab) |
| DNS for DHCP clients | `192.168.8.2` (Technitium on [CT 107](../containers/107-dns.md)) |
After creating the network, move any port forwards from the Slate AX into Fritz!Box → Internet → Permits (target IPs are now directly reachable on `192.168.8.x`).
## SODOLA configuration
All ports in VLAN 10, untagged (simple access-port setup):
| Port | PVID | Role |
|---|---|---|
| 1 | 10 | Uplink → Fritz!Box |
| 2 | 10 | hubris (Proxmox) |
| 3 | 10 | homelab device |
| 4 | 10 | homelab device |
| 5 | 10 | spare |
## Proxmox / LXC changes
If the Slate AX gateway was `192.168.8.1`: **no changes needed**. Fritz!Box takes the same IP.
If Slate AX used a different gateway (e.g. `.254`), update:
```bash
# on hubris
nano /etc/network/interfaces # change gateway line
ifreload -a
# for each LXC with a static gateway
pct config <id> # check net0: line for gw=
pct set <id> --net0 name=eth0,bridge=vmbr0,ip=<ip>/24,gw=192.168.8.1
```
## DNS after migration
Technitium ([CT 107](../containers/107-dns.md)) at `192.168.8.2` continues to serve split-horizon DNS for `hubris.network`. The Fritz!Box DHCP server for VLAN 10 hands out `192.168.8.2` as the DNS server. This fixes the "update router DHCP DNS from dead .180 → .2" outstanding item in [dns.md](../infrastructure/dns.md).
## Cutover procedure
1. Configure Fritz!Box second IP network (VLAN 10 / `192.168.8.1`) — verify DHCP works via a test laptop on the target port.
2. Configure SODOLA port VLAN assignments.
3. Connect SODOLA port 1 → Fritz!Box target LAN port.
4. Move hubris ethernet → SODOLA port 2. Proxmox should stay reachable immediately (same gateway IP).
5. Move remaining homelab devices to SODOLA ports 3–5.
6. Decommission Slate AX.
## Verification
```bash
# internet from Proxmox
ssh proxmox "ping -c3 1.1.1.1"
# Fritz!Box main LAN reachable (routing between VLANs works)
ssh proxmox "ping -c3 192.168.178.1"
# split-horizon DNS via Technitium still resolves
ssh proxmox "dig @192.168.8.2 +short git.hubris.network"
# expected: 192.168.8.175
# Caddy reverse proxy responds
curl -sk https://git.hubris.network | head -5
# Authentik on VPS still reachable
curl -sk https://auth.hubris.network/if/flow/default-authentication-flow/ | head -5
```
## Post-migration
- Update [network.md](../infrastructure/network.md) topology to reflect new state.
- Add changelog entries to [hosts/hubris.md](../hosts/hubris.md) and any affected container pages.
- Update status in [plans/index.md](index.md) to `Done`.
- If anything went sideways, open an investigation in `investigations/`.

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# Plans
Pre-flight runbooks for planned changes that haven't happened yet. Once executed, move the outcome to `investigations/` (if anything interesting happened) or just a changelog entry on the affected node pages.
## Index
| Date | Title | Status |
| ---- | ----- | ------ |
| 2026-06-01 | [Slate AX → SODOLA managed switch migration](2026-06-01-slate-ax-to-sodola-migration.md) | Planned |
## Conventions
- File name: `YYYY-MM-DD-<slug>.md`. Use the *target* date if known, otherwise the planning date.
- Status: `Planned` → `In Progress` → `Done` (update index entry as it moves).
- When done: add a changelog entry on every affected node page, then update status to `Done` here. If things went sideways, open an investigation.
- Plans are append-only once execution starts — don't rewrite pre-flight intent after the fact.