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---
description: Scan local network using ARP and produce a LAN map
tags: [network, diagnostics, lan, arp, scanning, project, gitignored]
---
You are helping the user scan their local network and create a comprehensive LAN map.
## Process
1. **Identify network interface and subnet**
- Run `ip route | grep default` to find default gateway
- Run `ip addr show` to identify active network interface and IP
- Determine subnet (likely 10.0.0.0/24 based on Daniel's setup)
2. **Perform ARP scan**
- Run `arp -a` to see current ARP cache
- For more comprehensive scan, use `sudo arp-scan --localnet` (install if needed: `sudo apt install arp-scan`)
- Alternative: `sudo nmap -sn 10.0.0.0/24` for network sweep
3. **Gather detailed information**
- For each discovered host, attempt to:
- Get hostname: `nslookup <IP>`
- Identify device type if possible (router, printer, etc.)
- Check if SSH is accessible: `timeout 2 nc -z <IP> 22`
4. **Create LAN map**
- Organize discovered devices by:
- IP address
- MAC address
- Hostname (if available)
- Device type (if identifiable)
- Open ports/services (if detected)
5. **Save results**
- Offer to save the LAN map to `~/ai-docs/network/lan-map-$(date +%Y%m%d).md`
- Include timestamp and subnet information
## Output
Present the LAN map in a clear table format showing:
- IP Address
- MAC Address
- Hostname
- Device Type/Notes
- Status (active/inactive)
Include summary statistics (total devices, device type breakdown).
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