Network Discovery

Network Discovery lets you scan subnets across your managed sites to find devices, identify their type and manufacturer, map open services, and build a topology of how hosts connect through routers and switches. Scans are executed by the Breeze agent running on a device within the target network. The agent performs ARP resolution, ICMP ping sweeps, TCP port scans, and SNMP queries, then reports results back to the API via WebSocket. Discovered assets are stored per-organization and automatically linked to enrolled devices when a MAC or IP address match is found.

Discovery profiles define what to scan and how. A profile is scoped to a single site and contains target subnets, scan methods, port ranges, SNMP communities, and a schedule. When a scan is triggered, a discovery job is created and dispatched through a background queue to an online agent at the profile’s site. Results are processed asynchronously — assets are created or updated, topology edges are enriched, and the job record is updated with summary statistics.

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Key Concepts

Scan Types

Method	Description	Privilege Required
arp	Sends ARP requests on the local subnet to resolve IP-to-MAC mappings using raw packet capture (pcap)	Root / Administrator
ping	ICMP echo request sweep to identify live hosts and measure round-trip time	Root / Administrator
port_scan	TCP connect scan against configured port ranges to identify open services	None
snmp	Queries SNMP system OIDs (sysDescr, sysObjectID, sysName) to identify device type and manufacturer	None

Discovery Profiles

A profile defines the complete configuration for a scan: which subnets to target, which methods to use, port ranges, SNMP credentials, and when scans should run. Profiles are scoped to an organization and site. Multiple profiles can exist per site to cover different network segments or scan strategies.

Discovered Assets

Each unique IP address found during a scan is stored as a discovered asset within the organization. Assets are classified by type (workstation, server, printer, router, switch, etc.) and track their status through a lifecycle:

Status	Meaning
new	Recently discovered, not yet reviewed
identified	Reviewed and classified but not linked to an enrolled device
managed	Linked to an enrolled Breeze agent device
ignored	Explicitly excluded from monitoring and reports
offline	Previously seen but not found in the most recent scan

Asset Types

Type	Classification Criteria
printer	SNMP sysDescr contains “printer”, or ports 9100/631 are open
router	SNMP indicates router, or gateway IP (.1/.254) with HTTP but no SSH/RDP
switch	SNMP sysDescr or sysObjectID contains “switch”
firewall	SNMP sysDescr or sysObjectID contains “firewall”
nas	SNMP indicates NAS/Synology/QNAP, or ports 5000+5001 open
access_point	SNMP indicates wireless or access point
server	SSH open with database or service ports (3306, 5432, 1433, 6379, etc.)
workstation	RDP (3389), SMB (445), SSH (22), or VNC (5900) open
unknown	Insufficient data to classify

Network Topology

Discovery automatically builds topology edges between gateway devices (routers, switches, firewalls, access points) and the endpoint hosts they connect. Topology data is stored in the network_topology table and returned as a graph of nodes and edges by the topology endpoint.

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Scan Types

ARP Scan

ARP scanning sends broadcast ARP requests on each matching network interface to resolve IP-to-MAC address mappings for all targets in the subnet. This is the most reliable method for discovering devices on the local L2 network segment.

Caution

ARP scanning requires root (Linux/macOS) or Administrator (Windows) privileges because it uses raw packet capture via libpcap. When the agent is built without CGO or lacks permissions, ARP scan falls back to reading the OS ARP cache, which only contains entries for hosts the agent has recently communicated with.

The agent iterates over local network interfaces, matches them against the requested subnets, and sends ARP requests for each target IP. Replies are collected within the configured timeout window.

ICMP Ping Sweep

The ping sweep sends ICMP Echo Request packets to every target IP in parallel using a configurable worker pool (default: 128 concurrent workers). Each responding host is recorded with its round-trip time.

Caution

ICMP ping requires root or elevated privileges to open raw sockets. The agent performs a pre-flight check before spawning workers — if the ICMP socket cannot be opened, the entire ping sweep is skipped gracefully with a warning log.

When both ping and port scan are enabled, the port scanner targets only the hosts that responded to ping, reducing scan time on large subnets.

TCP Port Scan

Port scanning uses TCP connect probes to check whether specific ports are open on each target. The scanner identifies well-known services by port number:

Port	Service	Port	Service
22	SSH	445	SMB
23	Telnet	1433	MSSQL
25	SMTP	3306	MySQL
53	DNS	3389	RDP
80	HTTP	5432	PostgreSQL
135	RPC	5672	AMQP
139	NetBIOS	5985/5986	WinRM
161	SNMP	6379	Redis
443	HTTPS	9100	Printer

Port scanning does not require elevated privileges and works on all platforms.

Default ports (when no portRanges are specified): 22, 80, 443, 445, 3389, 161, 139, 135, 5985, 5986, 9100

SNMP Discovery

SNMP discovery queries each target on UDP port 161 using the configured community strings (default: public). It fetches three system OIDs:

OID	Field	Usage
1.3.6.1.2.1.1.1.0	sysDescr	OS and device identification, manufacturer detection
1.3.6.1.2.1.1.2.0	sysObjectID	Device model and type classification
1.3.6.1.2.1.1.5.0	sysName	Hostname / device name

Both SNMPv2c and SNMPv3 (NoAuthNoPriv) are supported. To use SNMPv3, prefix the username with v3: in the snmpCommunities array:

{
  "snmpCommunities": ["public", "private", "v3:admin-user"]
}

SNMP data is used by the asset classifier to determine manufacturer (Cisco, HP, Dell, Juniper, MikroTik, Synology, QNAP, Ubiquiti, Fortinet) and device type.

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Discovery Profiles

Creating a Profile

Profiles define the full scan configuration and are scoped to an organization and site.

POST /discovery/profiles
Content-Type: application/json
Authorization: Bearer <token>

{
  "orgId": "uuid",
  "siteId": "uuid",
  "name": "Office LAN Scan",
  "description": "Weekly scan of main office subnet",
  "subnets": ["192.168.1.0/24", "192.168.2.0/24"],
  "excludeIps": ["192.168.1.1"],
  "methods": ["arp", "ping", "port_scan", "snmp"],
  "portRanges": ["22,80,443,445,3389"],
  "snmpCommunities": ["public"],
  "schedule": {
    "type": "cron",
    "cron": "0 2 * * 0"
  },
  "deepScan": false,
  "identifyOS": true,
  "resolveHostnames": true,
  "timeout": 3,
  "concurrency": 128
}

Profile Fields

Field	Type	Required	Description
orgId	UUID	Yes*	Organization ID. Auto-resolved for org-scoped tokens
siteId	UUID	Yes	Site the profile belongs to
name	string	Yes	Human-readable name (max 255 chars)
description	string	No	Optional description
subnets	string[]	Yes	CIDR subnets or individual IPs to scan
excludeIps	string[]	No	IPs to skip during scanning
methods	string[]	Yes	Scan methods: arp, ping, port_scan, snmp
portRanges	any	No	Port ranges for port scan (e.g., ["22,80,443", "1000-2000"])
snmpCommunities	string[]	No	SNMP community strings. Prefix v3: for SNMPv3 usernames
schedule	object	Yes	Schedule configuration (see below)
deepScan	boolean	No	Allow subnets larger than /16 (65,536+ hosts). Default false
identifyOS	boolean	No	Attempt OS fingerprinting from SNMP and port data. Default false
resolveHostnames	boolean	No	Perform reverse DNS lookups. Default false
timeout	integer	No	Per-probe timeout in seconds. Default 2
concurrency	integer	No	Number of concurrent workers. Default 128

Schedule Types

Type	Required Fields	Description
manual	None	Only runs when triggered via POST /discovery/scan
cron	cron	Standard cron expression for recurring scans
interval	intervalMinutes	Run every N minutes

Note

Subnets larger than a /16 (65,536 hosts) are skipped unless deepScan is set to true. This prevents accidental full-class-B scans that could take a long time and generate significant network traffic.

Updating a Profile

PATCH /discovery/profiles/:id
Content-Type: application/json

{
  "subnets": ["10.0.0.0/24"],
  "enabled": false
}

Only the fields you include are updated. Omitted fields retain their current values.

Deleting a Profile

DELETE /discovery/profiles/:id

Deleting a profile also removes all associated discovery jobs in a single transaction.

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Running Scans

Triggering a Scan

To run a scan immediately, POST to the scan endpoint with the profile ID and an optional agent ID:

POST /discovery/scan
Content-Type: application/json
Authorization: Bearer <token>

{
  "profileId": "uuid",
  "agentId": "optional-agent-id"
}

If agentId is omitted, the system automatically selects an online agent from the profile’s site. The scan is dispatched through a background queue to the discovery worker, which sends a network_discovery command to the agent via WebSocket.

Tip

The response returns a discovery job object with status scheduled. The scan transitions to running once the agent receives the command, and to completed when results have been processed.

Scan Execution Flow

1. API creates a discovery job with status scheduled and enqueues a dispatch-scan task in the background queue.

2. Discovery worker picks up the task, loads the profile, finds an online agent at the site, and sends a network_discovery command via WebSocket.

3. Agent receives the command and runs the configured scan methods (ARP, ping, port scan, SNMP) against the target subnets.

4. Agent returns results via WebSocket as a command_result message containing the list of discovered hosts.

5. API enqueues a process-results task in the background queue. The worker creates or updates discovered assets, auto-links matches to enrolled devices by MAC/IP, enriches the network topology, and marks the job as completed.

Monitoring Job Status

List all jobs:

GET /discovery/jobs?orgId=uuid

Get job detail with discovered assets:

GET /discovery/jobs/:id

The detail endpoint returns the job record plus all discovered assets associated with the job.

Cancelling a Job

Jobs with status scheduled or running can be cancelled:

POST /discovery/jobs/:id/cancel

The job status is set to cancelled and the system attempts to remove it from the background queue. If the scan is already in progress on the agent, cancellation takes effect when results arrive — cancelled jobs skip result processing.

Job Statuses

Status	Meaning
scheduled	Job created, waiting to be dispatched to an agent
running	Command sent to agent, scan in progress
completed	Results processed, assets upserted
failed	No online agent available, profile not found, or dispatch error
cancelled	Cancelled by an administrator before completion

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Discovered Assets

Viewing Assets

List all discovered assets with optional filters:

GET /discovery/assets?orgId=uuid&status=new&assetType=router

Filter parameters:

Parameter	Values
orgId	UUID of the organization
status	new, identified, managed, ignored, offline
assetType	workstation, server, printer, router, switch, firewall, access_point, phone, iot, camera, nas, unknown

Each asset in the response includes monitoring status flags:

Field	Description
snmpMonitoringEnabled	Whether an active SNMP monitor is attached to this asset
networkMonitoringEnabled	Whether an active network monitor (ping, TCP, HTTP, DNS) is attached
monitoringEnabled	true if either SNMP or network monitoring is active
linkedDeviceName	Display name or hostname of the linked enrolled device, if any

Linking an Asset to a Device

Manually link a discovered asset to an enrolled device. This sets the asset status to managed:

POST /discovery/assets/:id/link
Content-Type: application/json

{
  "deviceId": "uuid"
}

Note

Auto-linking happens automatically during scan result processing. The worker matches assets to enrolled devices by MAC address or IP address within the same organization. Manual linking is only needed when auto-linking does not find a match.

Ignoring an Asset

Mark an asset as ignored to exclude it from dashboards and reports:

POST /discovery/assets/:id/ignore
Content-Type: application/json

{
  "reason": "Test device, not production"
}

The reason field is optional (max 1,000 characters). The asset records who ignored it and when.

Deleting an Asset

DELETE /discovery/assets/:id

Deleting an asset also removes all associated SNMP devices (and their metrics and alert thresholds) and network monitors in a single transaction.

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Network Topology

The topology endpoint returns a graph representation of discovered assets and their connections:

GET /discovery/topology?orgId=uuid

Response structure:

{
  "nodes": [
    {
      "id": "uuid",
      "type": "router",
      "label": "gateway.local",
      "status": "managed",
      "ipAddress": "192.168.1.1",
      "macAddress": "aa:bb:cc:dd:ee:ff"
    }
  ],
  "edges": [
    {
      "id": "uuid",
      "sourceId": "uuid",
      "targetId": "uuid",
      "sourceType": "discovered_asset",
      "targetType": "discovered_asset",
      "connectionType": "routed",
      "bandwidth": null,
      "latency": 1.2
    }
  ]
}

Topology edges are automatically created during result processing. The system links gateway devices (routers, switches, firewalls, access points) to all endpoint hosts discovered in the same scan. Connection type is ethernet for switches and routed for all other gateway types. Existing edges are updated with a new lastVerifiedAt timestamp on each scan.

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Network Monitors

Discovered assets can be attached to network monitors for ongoing health checking. Monitors are managed through the dedicated /monitoring routes and support four check types:

Monitor Type	Description
icmp_ping	Periodic ICMP ping to check availability and measure latency
tcp_port	TCP connect check against a specific port
http_check	HTTP/HTTPS request with status code and response time validation
dns_check	DNS resolution check for a target hostname

Each monitor tracks its current status (online, offline, degraded, unknown), last response time, consecutive failure count, and stores a history of check results. Alert rules can be configured per monitor to trigger notifications on failure thresholds.

The asset list endpoint (GET /discovery/assets) includes snmpMonitoringEnabled and networkMonitoringEnabled flags so you can see at a glance which assets have active monitoring.

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API Reference

Discovery Profiles

Method	Path	Description
GET	/discovery/profiles	List profiles (?orgId=)
POST	/discovery/profiles	Create a new profile
GET	/discovery/profiles/:id	Get profile by ID
PATCH	/discovery/profiles/:id	Update profile fields
DELETE	/discovery/profiles/:id	Delete profile and associated jobs

Scan Jobs

Method	Path	Description
POST	/discovery/scan	Trigger a scan (profileId, optional agentId)
GET	/discovery/jobs	List all jobs (?orgId=)
GET	/discovery/jobs/:id	Get job detail with discovered assets
POST	/discovery/jobs/:id/cancel	Cancel a scheduled or running job

Discovered Assets

Method	Path	Description
GET	/discovery/assets	List assets (?orgId=&status=&assetType=)
POST	/discovery/assets/:id/link	Link asset to enrolled device
POST	/discovery/assets/:id/ignore	Mark asset as ignored
DELETE	/discovery/assets/:id	Delete asset and associated monitors

Network Topology

Method	Path	Description
GET	/discovery/topology	Get topology graph (?orgId=)

Note

All discovery endpoints require authentication and one of these scopes: organization, partner, or system. Organization-scoped tokens are automatically restricted to their own organization’s data.

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Troubleshooting

ARP and ping scans return no results. ARP scanning requires root/Administrator privileges and the libpcap library. ICMP ping also requires raw socket access. If the agent runs as a non-privileged user, both methods are skipped. Check agent logs for messages like “ARP scan unavailable (built without CGO/pcap)” or “ICMP ping unavailable (requires root/elevated privileges)”. Port scanning works without elevated privileges and can be used as an alternative.

Scan job stays in scheduled status. The discovery worker requires Redis and the background queue to dispatch scan commands. Verify Redis is running and accessible. If Redis is unavailable, the job is immediately marked as failed with the message “Background job service unavailable.” Also confirm at least one agent at the profile’s site is online — the worker selects an online agent from the same site to execute the scan.

Large subnets are skipped. Subnets larger than /16 (65,536+ hosts) are skipped by default to prevent excessive scan times and network traffic. Set deepScan: true on the profile to allow scanning of large subnets. Monitor the agent’s resource usage when scanning large address ranges.

Discovered assets are not auto-linking to enrolled devices. Auto-linking matches assets to enrolled devices by MAC address or IP address within the same organization using the device_network table. If the enrolled device has a different IP than what discovery sees (e.g., the device is behind NAT or uses a VPN), auto-linking will not find a match. Use POST /discovery/assets/:id/link to manually link the asset to the correct device.