Why Your SCADA Goes Offline When the Router Reboots

The Problem

When someone reboots the router, SCADA cannot communicate with half your devices. This is completely preventable.

Root Causes

DHCP Leases Expiring

Solution: Use static IP addresses for all industrial devices.

Switch Learning MAC Tables

Solution: Save switch configuration so MAC tables persist.

No Redundant Network Path

Solution: Design networks with redundancy using RSTP or industrial ring protocols.

Network Equipment Without UPS

Solution: All network equipment must have UPS backup.

Proper Industrial Network Design

Create a static IP addressing scheme, use industrial-grade switches, implement redundancy, and maintain configuration backups.

Troubleshooting Steps

1. Verify physical connectivity
2. Verify IP configuration
3. Verify protocol communication
4. Check switch configuration
5. Restart services in order

Prevention Checklist

Use static IP addresses, provide UPS backup, implement redundancy, use industrial-grade equipment, and maintain configuration backups.

Conclusion

SCADA communication reliability starts with proper network design. Do not let a router reboot bring down your operation.