Why it is worth attention

It combines multiple monitoring protocols (ICMP, SNMP v2c) with real-time updates via SignalR, device discovery over CIDR, and a modern React frontend, all within a single open-source platform.

Who it is for

Small network administrators
DevOps teams monitoring infrastructure
Developers building full-stack monitoring applications
IT professionals needing lightweight network discovery tools

Use cases

Monitor device availability with periodic ICMP pings
Discover active devices on a subnet using CIDR scanning
Explore system information and interfaces via read-only SNMP
View historical ping latency charts and recent check results

Strengths

Real-time dashboard updates through SignalR with a REST fallback
Background ICMP monitoring with persistent history and 24-hour summaries
Bounded IPv4 CIDR discovery including reverse DNS lookups
Read-only SNMP v2c explorer for custom GET and WALK queries

Considerations

Monitoring counters are stored in process memory and reset on API restart
SNMP community credentials are request-only and not persisted by the API
Project is in MVP stage; planned features like incident tracking and bandwidth monitoring are not yet implemented

README quick start

Network Monitor

A web-based network monitoring platform built with ASP.NET Core and React. The MVP includes a responsive dashboard backed entirely by the live API.

Tech Stack

ASP.NET Core Web API
C#
React
TypeScript
Vite

Current Capabilities

SQLite persistence
Device management and REST CRUD API
Background ICMP monitoring
Persistent ping check history and 24-hour monitoring summaries
Responsive Overview, Devices, and Device Detail screens
Realtime monitoring updates via SignalR with REST fallback
Bounded IPv4 CIDR discovery with ICMP ping and reverse DNS
Read-only SNMP v2c explorer for system information, interfaces, and custom GET/WALK queries
Latency history charts and recent check results

Monitoring status counters are kept in process memory for the MVP and reset when the API restarts. SNMP community credentials are request-only and are not persisted or returned by the API.

Local Development

The API development profile runs at http://localhost:5107. The Vite app uses that address by default; copy frontend/network-monitor-ui/.env.example to .env only when you need to override it.

Start the backend:

dotnet run --project backend/NetworkMonitor.Api --launch-profile http

Start the frontend in another terminal:

cd frontend/network-monitor-ui
npm install
npm run dev

Open http://localhost:5173.

Planned Features

Incident tracking
Interface and bandwidth monitoring
Network topology

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