How to Connect Office, Surveillance, and Environmental Monitoring Networks Without VLANs: Leveraging Multiple IP Addresses on a Single VLAN Interface

Zoe Waters — Thu, 09 Jul 2026 07:35:18 +0000

Struggling to split a flat 192.168.0.0/16 factory network into distinct office (192.168.1.0/24), surveillance (192.168.2.0/24), and environmental monitoring (192.168.3.0/24) subnets when only IP addresses can be changed and all you have are unmanaged switches? This guide details a proven workaround: deploy a Layer 3 switch and assign a primary IP alongside multiple secondary IP addresses on a single VLANIF interface to serve as gateways for each segment. By relying purely on Layer 3 routing, the solution enables seamless inter-subnet communication without VLAN tagging or re-cabling. You’ll walk away with a clear, implementable blueprint to achieve full connectivity between partitioned subnets using completely flat, unmanaged switching hardware.

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How to Connect Office, Surveillance, and Environmental Monitoring Networks Without VLANs: Leveraging Multiple IP Addresses on a Single VLAN Interface