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117 lines
4.2 KiB
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117 lines
4.2 KiB
Markdown
# How-To: `pos network`
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Networking day-to-day: IP/diagnostic info, Wi-Fi hotspots, host discovery, and
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port checks. Tools: `ip`, `hotspot`, `scan`, `checkport`.
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| Tool | What it does |
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|------|--------------|
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| `pos network ip` | Interfaces, default route, public IP + location |
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| `pos network hotspot` | Wi-Fi AP via `create_ap` / `wihotspot-gui` |
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| `pos network scan` | Two-phase host discovery with `nmap` |
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| `pos network checkport` | Is a TCP port open on a host? |
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---
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## `pos network ip` — where am I, what's my IP
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```bash
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pos network ip
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```
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Shows local interfaces + addresses, the default route, and your public IP with
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its geolocation. Useful before `ssh`-ing home or opening ports.
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**Recipe:** public IP on the go — this is the same value the health digest
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includes, so if your home IP changed you'll see it in the 08:00 report.
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**Troubleshooting:** the public-IP lookup needs outbound HTTPS; if it prints
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"unreachable"/location unknown, your network or a firewall is blocking
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`api.ipify.org` / the geo provider.
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---
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## `pos network hotspot` — turn the machine into a Wi-Fi AP
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Requires the precompiled `create_ap` + `wihotspot-gui` binaries shipped in
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`x64_bin/` (or `arm64_bin/`) and installed to `/usr/local/bin` by `install.sh`.
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The GUI needs a desktop session; the CLI needs a wireless NIC in AP mode.
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```bash
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pos network hotspot # launch the wihotspot-gui
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pos network hotspot start wlan0 eth0 MyNet mypass # AP on wlan0, internet via eth0
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pos network hotspot start --foreground wlan0 eth0 MyNet mypass # block until Ctrl+C
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pos network hotspot stop # stop the running AP (auto-detected)
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pos network hotspot stop wlan0 # stop by interface/PID
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pos network hotspot status # list running APs
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```
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Positional args: `<wifi-iface> [<internet-iface>] <ssid> [<passphrase>]`.
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Without `--foreground`, it asks whether to run in the background; daemonized APs
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log to `/var/log/linux_post_install_hotspot.log`.
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**Recipes:**
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- Give guests internet while tethered: `pos network hotspot start wlan0 eth0 GuestNet secret`.
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- After starting, find who joined with `pos network scan 192.168.42.0/24` (create_ap
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default subnet) or `pos network checkport <phone-ip>:80`.
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**Troubleshooting:**
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- `create_ap` not found → the precompiled binary wasn't installed; re-run
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`./install.sh` (Phase 2 copies `x64_bin/` → `/usr/local/bin`).
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- "No suitable AP mode" → your Wi-Fi card/driver doesn't support AP mode; use the
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GUI (wihotspot-gui) or a USB dongle.
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- Client has IP but no internet → check the `<internet-iface>` arg / NAT
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forwarding; `create_ap --daemon` logs to the hotspot logfile.
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---
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## `pos network scan` — find hosts on the LAN
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Requires `nmap` (`sudo apt install nmap`).
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```bash
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pos network scan 192.168.1.0/24 # fast discovery
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pos network scan 10.0.0.0/28 --full # + OS, ports, services, NSE scripts
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pos network scan 172.1.1.104 # single host
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pos network scan 192.168.1.0/24 --retries 3
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```
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Two phases: fast ping-sweep discovery, then — only with `--full` — a detailed
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metadata scan on the alive hosts.
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**Recipe:** after `pos network hotspot start`, find attached clients:
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`pos network scan 192.168.42.0/24`.
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**Troubleshooting:** `nmap` missing → install it. Scanning a remote/hostile
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network without permission is not advisable; `--full` is slow — scope it to a
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`/24` or a single host.
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---
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## `pos network checkport` — is a port open?
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```bash
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pos network checkport 192.168.1.1:80
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pos network checkport 10.0.0.5:443
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```
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Exits non-zero if the port is closed/unreachable, so you can chain it:
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**Recipe:** confirm a self-hosted service is up before alerting:
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```bash
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pos network checkport jellyfin.local:8096 && notify_send "Jellyfin reachable" \
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|| notify_send "Jellyfin DOWN"
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```
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(see [communication](communication.md) for `notify_send`).
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**Troubleshooting:** a "closed" answer from a host that *is* up usually means a
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local firewall — check `sudo pos system firewall` rules and service binds
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(`ss -tlnp`).
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---
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## Related
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- Reference tables: [DOC/POS.md → network](../POS.md)
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- Firewall that may block these: [system.md](system.md)
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- Public IP in the daily digest: [system.md → health](system.md)
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