Choosing the right open-source SNMP monitoring tool is harder than it looks. Each tool optimizes for different deployment scenarios, and a solution that works brilliantly for 10 devices can collapse under 10,000 devices. This guide compares the most popular options with real metrics.
Full Comparison Table
| Dimension | YAD | LibreNMS | Zabbix | Prometheus |
|---|---|---|---|---|
| Ease of Setup | 5 min, single binary | 30–60 min, LAMP stack | 45 min, DB + agent | 10 min, binary + config |
| Base Memory | 50–100 MB | 500 MB–2 GB | 200 MB–1 GB | 500 MB–1 GB |
| Typical Disk | 1 GB / 1000 devices | 10–50 GB | 20–100 GB | 5–20 GB |
| SNMP v1/v2c | ✅ Full | ✅ Full | ✅ Full | ⚠️ Via exporter |
| SNMP v3 | ✅ Full (auth + encrypt) | ✅ Full | ✅ Full | ⚠️ Via exporter |
| Auto-Discovery | SNMP, ping, manual | SNMP, LLDP, CDP, ARP | Manual + agent | Manual push |
| Web UI | Modern responsive | Enterprise, PHP-based | Heavy, feature-rich | Graph-only (Grafana) |
| Mobile UI | ✅ Full | Limited | Very limited | Requires Grafana |
| Alerting | Webhooks, email | Advanced rules, escalation | Very advanced (3+ backends) | Alertmanager |
| Single Binary | ✅ Yes | ❌ No (LAMP + MariaDB) | ❌ No (server + agent) | ✅ Yes |
| Runs Where | Linux, macOS, Windows, containers | Linux (CentOS, Ubuntu) | Linux, Windows | Linux, containers |
| Price per 1000 devices | $0 | $0 | $0 (or $$$$ commercial) | $0 |
| Best For | ISPs, small MSPs, on-edge | Medium ISPs, enterprise | Large enterprises, sprawl | Cloud-native K8s |
| Learning Curve | 1–2 days | 3–5 days | 1–2 weeks | 2–3 weeks |
Use Case Breakdown
Scenario 1: 10–50 Devices (Single Tech)
Best Choice: YAD
A 50-customer ISP with 3 routers, 10 switches, 20 optical nodes, and some customer CPE. You have one technician, limited budget, and you need something running today.
- YAD advantage: Download binary,
./yad &, add 50 devices in 1 hour via web UI, SNMP discovery, done. - Cost: $0 hardware, $0 software, 2 hours setup
- Memory: Single Raspberry Pi 5 ($60)
- Polling interval: 30 seconds per device
- Estimated CPU: 5–10% of RPi 5 core
LibreNMS would also work but is overkill—you’re setting up MariaDB, PHP-FPM, Nginx, just to monitor 50 devices. Zabbix needs an agent on every device, which adds complexity.
Scenario 2: 50–500 Devices (Regional ISP or MSP)
Best Choice: LibreNMS
You run an ISP with 150 customer locations, each with a router + switch. Your NOC team is 3–4 people, and you need serious alerting, escalation, reporting, and integration with ticketing systems (osTicket, Jira).
- LibreNMS advantages:
- Native LLDP/CDP topology discovery (auto-map entire network)
- Advanced alert rules: “If device X parent is down, suppress alerts for X children”
- Rich reporting: SNMP vs API comparisons, SLA calculations
- Web UI designed for operations teams (not single-user)
- Community is large (~5000 deployments globally)
- Runs on simple LAMP: CentOS + MariaDB + Apache
- Cost: $0 software, ~$200–500 hardware (used server, or 2 cloud VMs)
- Memory: 2–4 GB dedicated
- Polling interval: 5 minutes (more than YAD’s 30s, but scales better)
- Integration: REST API, syslog ingestion, SNMP traps, MQTT
Zabbix also works at this scale but requires agent deployment on every monitored device. If you have 150 routers all running RouterOS, installing agents is tedious.
Scenario 3: 500–5000 Devices (Large ISP, Multi-region MSP)
Best Choice: Zabbix
Your company has 2000 monitored nodes across 5 regions. You have a dedicated monitoring team, compliance requirements (SLA reporting, audit logs), and you’re integrating with Puppet/Ansible for config management.
- Zabbix advantages:
- Scalability: Single Zabbix server handles 10,000+ devices with proper tuning (DB partitioning, caching)
- Flexible data collection: SNMP + API + custom scripts + agents all in one system
- Advanced SLA tracking (percentage uptime over calendar quarters)
- Multi-level escalation: On-call rotation, management approval workflows
- Fine-grained RBAC: Different teams see only their devices
- Hundreds of pre-built device templates (Cisco, Juniper, Arista, etc.)
- Cost: $0 software, ~$2000–5000 dedicated infrastructure (DB server, Zabbix server, HA)
- Memory: 4–8 GB minimum (can scale to 64 GB)
- Time to deploy: 4–6 weeks (DB tuning, template creation, integration testing)
- Polling interval: 1–5 minutes typical
YAD would struggle at 5000 devices. LibreNMS would hit database query bottlenecks around 2000 devices without significant tuning.
Scenario 4: Cloud-Native or Kubernetes Monitoring
Best Choice: Prometheus
You run microservices on Kubernetes, or you’re a SaaS company monitoring 500+ internal services. SNMP is irrelevant—you collect metrics from application instrumentation (golang, Python, Node.js). You want pull-based metrics, ephemeral targets, and integration with Grafana.
- Prometheus advantages:
- Pull model (targets register themselves via service discovery)
- Kubernetes native (Prometheus Operator, Helm charts)
- Time-series database optimized for 1M+ metrics/second
- PromQL query language for complex aggregations
- Seamless with Grafana for visualization
- Cost: $0 software, Kubernetes cluster (likely already owned)
- Not suitable for: Legacy SNMP-only equipment, non-Kubernetes infrastructure
Caveat: Prometheus doesn’t do traditional SNMP well. If you need SNMP, you add Prometheus SNMP Exporter (a separate binary that translates SNMP OIDs to Prometheus metrics). This adds latency and complexity.
Head-to-Head Scenarios
Scenario A: ISP with 5 routers, 20 switches, 100 customer CPE
| Tool | Setup Time | Monthly Cost | Team Size | Effort to Alert | Verdict |
|---|---|---|---|---|---|
| YAD | 2h | $0 | 1 person | 30min | Winner |
| LibreNMS | 8h | $0 | 1–2 people | 2h | Overkill |
| Zabbix | 24h | $0 | 1–2 people | 4h | Way overkill |
Scenario B: MSP with 500 customer sites, 2 techs, 1 NOC person
| Tool | Setup Time | Monthly Cost | Team Size | Scalability | Verdict |
|---|---|---|---|---|---|
| YAD | 8h | $0 | 1–2 people | Hits limits at 500 devices | Risky |
| LibreNMS | 16h | $0–50 | 2–3 people | Fine to 2000 devices | Winner |
| Zabbix | 40h | $0–100 | 2–3 people | Fine to 10k devices | Overengineered |
Scenario C: Enterprise with 5000+ monitored nodes, 10-person team
| Tool | Suited? | Scaling Path | Effort |
|---|---|---|---|
| YAD | ❌ No | Would need sharding (not supported) | Not viable |
| LibreNMS | ⚠️ Marginal | Heavy DB tuning required | 3–4 weeks optimization |
| Zabbix | ✅ Yes | Native HA, partitioning, replication | 2–4 weeks setup |
| Prometheus | ✅ Yes (if app metrics) | Cortex/Thanos for long-term retention | 2–3 weeks setup |
Real Costs (What Nobody Talks About)
Choosing the “free” tool is meaningless if it wastes your team’s time.
YAD for 200 devices
- Setup: 4 hours
- Maintenance/year: 2 hours (updates, occasional troubleshooting)
- Annual cost: 6 hours labor ≈ $600–1200
LibreNMS for 200 devices
- Setup: 12 hours (LAMP stack, database tuning)
- Maintenance/year: 20 hours (MariaDB backups, PHP security updates, plugin maintenance)
- Annual cost: 32 hours labor ≈ $3200–6400
Zabbix for 200 devices
- Setup: 24 hours (agent deployment, template creation)
- Maintenance/year: 30+ hours (Zabbix updates, DB partitioning, alert rule maintenance)
- Annual cost: 54+ hours labor ≈ $5400–10800
For small networks, YAD’s simplicity is worth thousands in avoided operational overhead.
Integration Checklist
| Integration | YAD | LibreNMS | Zabbix | Prometheus |
|---|---|---|---|---|
| Slack alerts | ✅ Webhooks | ✅ Built-in | ✅ Custom scripts | ✅ Alertmanager |
| PagerDuty | ✅ Webhooks | ✅ Integration | ✅ Native | ✅ Native |
| Email/SMS | ✅ Simple | ✅ Advanced rules | ✅ Very advanced | ⚠️ Requires Alertmanager |
| SNMP traps | ❌ No | ✅ Yes | ✅ Yes | N/A |
| Syslog | ❌ No | ✅ Yes | ✅ Limited | N/A |
| REST API | ✅ Full | ✅ Full | ✅ Full | ✅ Full |
| Custom webhook | ✅ Yes | ✅ Yes | ✅ Yes | ✅ Yes |
Bottom Line
- 10–100 devices, one person, ISP/MSP: Use YAD. Deploy in 5 minutes, monitor forever with 50MB RAM.
- 100–1000 devices, need topology mapping and advanced alerting: Use LibreNMS. A little heavier to maintain, but purpose-built for ISPs.
- 1000+ devices, multiple teams, compliance requirements: Use Zabbix. Enterprise-grade, but needs proper infrastructure investment.
- Cloud/Kubernetes, app metrics only: Use Prometheus + Grafana. SNMP doesn’t apply.
All four are free. Choose based on your scale, team size, and operational complexity. For most ISPs and MSPs reading this, LibreNMS or YAD will serve you well for the next 5 years.
Download YAD → yetanotherdude.io
Or explore LibreNMS at librenms.org