NetworkMonitor

4# Network Monitoring System

A comprehensive network monitoring solution that provides real-time monitoring, alerting, and reporting for network devices and services.

Features

• Device Monitoring

  • Automatic device discovery
  • Multi-vendor support (Cisco, Juniper, HP/Aruba, etc.)
  • Layer 2 and Layer 3 topology mapping
  • Hardware health monitoring

• Network Services Monitoring

  • DNS health and response times
  • DHCP lease status
  • Active Directory replication
  • Load balancer status

• Performance Monitoring

  • Bandwidth utilization
  • Packet loss rates
  • Latency measurements
  • QoS metrics
  • Interface errors and discards

• Security Monitoring

  • Unusual traffic patterns
  • Port security violations
  • ACL violations
  • Authentication failures

• Smart Alerting

  • Multi-tier alerting (Critical, Warning, Info)
  • Alert correlation and deduplication
  • Business impact assessment
  • Rich context in notifications
  • Customizable escalation paths

• Reporting

  • Daily health summaries
  • Weekly trend analysis
  • Monthly capacity planning
  • Custom report generation

Prerequisites

• Python 3.8 or higher
• Network access to monitored devices
• SNMP access configured on network devices
• SSH access for configuration verification
• Required Python packages:

  networkx>=2.5
  requests>=2.25.1
  jinja2>=2.11.3
  pysnmp>=4.4.12
  scapy>=2.4.4
  dnspython>=2.1.0
  python-ldap>=3.3.1
  

Installation

1. Clone the repository:

   git clone https://github.com/your-org/network-monitor.git
   cd network-monitor

2. Create a virtual environment:

   python -m venv venv
   source venv/bin/activate  # Linux/Mac
   # or
   .\venv\Scripts\activate  # Windows

3. Install dependencies:

   pip install -r requirements.txt

4. Create configuration file:

   cp config/config.example.json config/config.json

5. Update configuration with your environment details:

   • Network ranges for device discovery
   • Device credentials
   • SMTP settings for email alerts
   • Slack webhook URL for Slack notifications
   • Business service definitions

Configuration

Basic Configuration

1. Set up device discovery:

   {
     "devices": {
       "enable_discovery": true,
       "discovery_networks": [
         "192.168.1.0/24",
         "10.0.0.0/24"
       ]
     }
   }

2. Configure credentials:

   {
     "devices": {
       "credentials": {
         "cisco_devices": {
           "username": "admin",
           "password": "{{ CISCO_PASSWORD }}",
           "enable_password": "{{ CISCO_ENABLE }}"
         }
       }
     }
   }

3. Set up notifications:

   {
     "alerting": {
       "notifications": {
         "slack_enabled": true,
         "slack_webhook_url": "{{ SLACK_WEBHOOK_URL }}",
         "email_enabled": true,
         "smtp": {
           "server": "smtp.company.com",
           "port": 587
         }
       }
     }
   }

Advanced Configuration

1. Custom monitoring thresholds:

   {
     "metrics": {
       "thresholds": {
         "network_performance": {
           "bandwidth_utilization": {
             "warning": 70,
             "critical": 85
           }
         }
       }
     }
   }

2. Business service definitions:

   {
     "alerting": {
       "business_services": [
         {
           "name": "Core Network",
           "priority": 1,
           "dependencies": ["192.168.1.1"]
         }
       ]
     }
   }

Usage

Starting the Monitor

1. Basic monitoring:

   python network_monitor.py

2. With debug logging:

   python network_monitor.py --debug

3. With custom config:

   python network_monitor.py --config /path/to/config.json

Common Operations

1. Force topology refresh:

   python network_monitor.py --refresh-topology

2. Generate reports:

   python network_monitor.py --generate-report daily
   python network_monitor.py --generate-report weekly

3. Test notifications:

   python network_monitor.py --test-notifications

Alert Levels

1. Critical Alerts

   • Immediate action required
   • Service-affecting issues
   • Security incidents
   • Hardware failures

2. Warning Alerts

   • Performance degradation
   • Capacity thresholds
   • Configuration issues
   • Trending towards critical

3. Info Alerts

   • System changes
   • Performance statistics
   • Routine events
   • Baseline updates

Troubleshooting

Common Issues

1. Device Discovery Failures

   • Verify network connectivity
   • Check SNMP credentials
   • Confirm firewall rules
   • Validate IP ranges

2. Alert Notification Issues

   • Verify SMTP settings
   • Check Slack webhook URL
   • Confirm recipient addresses
   • Review notification logs

3. Performance Issues

   • Adjust polling intervals
   • Optimize SNMP queries
   • Review batch sizes
   • Check resource usage

Logging

Logs are stored in the logs directory:

• network_monitor.log: Main application log
• alert_manager.log: Alert processing log
• device_discovery.log: Device discovery log
• metrics_collection.log: Metrics collection log

Debug Mode

Enable debug logging for detailed information:

python network_monitor.py --debug

Contributing

1. Fork the repository
2. Create a feature branch
3. Make your changes
4. Submit a pull request

License

This project is licensed under the MIT License - see the LICENSE file for details.

Support

For support:

• Open an issue on GitHub
• Contact: support@company.com
• Documentation: https://docs.company.com/network-monitor