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docs: Herdr from outside the LAN, plus a fallback leg

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Records that no extra configuration is needed for remote use: the transport
already reaches 192.168.10.20 over Tailscale via the subnet router, which is
the same path used from VLAN 20 at home.

Adds a fallback to Tailscale SSH on 100.100.208.69 for the case where the
mikrotik-tailscale container dies while Unraid stays up. The target is chosen
by a TCP probe before any ssh starts, since a failed first attempt would
consume stdin and corrupt the retry.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
Kaloyan DanchevandClaude Opus 5 committed 2026-11-03 22:50:25 +02:00
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docs/14-HERDR-REMOTE-MACHINES.md
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@@ -52,7 +52,41 @@ exec ssh -T -o BatchMode=yes -o ConnectTimeout=10 \
"export XDG_RUNTIME_DIR=/var/run/herdr-rt; mkdir -p \"\$XDG_RUNTIME_DIR\" && chmod 700 \"\$XDG_RUNTIME_DIR\"; $*"
```
## Why the LAN address and not the Tailscale IP
## Working from outside the LAN
No extra configuration is needed. The transport targets `192.168.10.20:422`, and
a Mac away from home reaches that over Tailscale via the `mikrotik-tailscale`
subnet router, which is primary for `192.168.10.0/24`. This is not a special
remote mode — it is the same path used on VLAN 20 at home, since that is also a
different subnet from Unraid.
Prerequisites on the client:
| Requirement | Check |
|-------------|-------|
| Tailscale running and logged in | `tailscale status` |
| Accepts the hAP's subnet routes | `tailscale debug prefs` shows `"RouteAll": true` |
| Route resolves over Tailscale | `route -n get 192.168.10.20` reports `utun*`, not `en0` |
### Fallback leg
The LAN path depends on the `mikrotik-tailscale` container, which has failed
before (see the 2026-08-10 recovery note in `docs/09-TAILSCALE-VPN.md`). If it
dies while Unraid stays up, `192.168.10.20` becomes unreachable over Tailscale
but Unraid's own node does not.
So the wrapper probes `192.168.10.20:422` first and falls back to Tailscale SSH
on `100.100.208.69:22`. The probe runs **before** any ssh starts, because a
failed first attempt would consume stdin and corrupt the retry. It costs about
245 ms on the success path. `HERDR_VIA_TARGET=lan|ts` forces a leg for testing;
both were verified 2026-11-03.
The fallback leg inherits the tailnet ACL caveat below: with the default
`action: "check"` it works until the grant lapses, then wants a browser
re-auth. Setting that rule to `accept` for `autogroup:self` makes the fallback
fully unattended.
## Why the LAN address is the primary and not the Tailscale IP
`--via` requires a transport that passes bytes untouched and **asks nothing**.
Tailscale SSH on `100.100.208.69` sits behind the default tailnet ACL