IPplan is a classic, web-based open-source IP Address Management (IPAM) tool used by network administrators to track, organize, and manage IPv4 and IPv6 spaces. Instead of manual, error-prone spreadsheets, an efficient subnetting guide utilizing IPplan structures your network hierarchically.
The process is divided into a clear, structured configuration and implementation flow. Phase 1: Preparation & Initial Configuration
Before carving out subnets, you must configure the initial database boundary.
Define Admin Access: Access the application using your master administrative credentials (often configured inside the config.php file).
Establish Groups and Users: Create specific user roles. Large enterprises should separate permissions: create one group authorized to build customers/supernets, and another group restricted to modifying individual IP address records.
Assign Customers: IPplan works on a multi-tenant model. Create a “Customer” profile to serve as the parent container for your specific organizational branch or infrastructure block. Phase 2: Creating the Supernet
An efficient subnetting plan avoids address fragmentation by creating a large master IP block (Supernet) before dividing it.
Input Core Routing Prefix: Navigate to the network architecture section and input your wide allocation block (e.g., 10.0.0.0/11).
Define Regional or Functional Blocks: Dedicate subsequent large blocks to high-level zones (e.g., European HQ, US Datacenter, or Remote Branches). This keeps routing tables small and optimized. Phase 3: Efficient Subnetting (The Divison Step)
Once your Supernet container is live, you can efficiently divide it without overlapping address segments.
Determine Host Constraints: Calculate the exact number of devices (PCs, servers, IoT gear, printers) needing access in a target zone.
Calculate the CIDR Mask: Do not deploy blanket oversized subnets. For example, if a department requires 200 hosts, use a /24 mask (254 usable IPs) to safely accommodate growth while keeping broadcast domains small and stable.
Execute the Split in IPplan: Use IPplan’s built-in subnetting engine to carve out smaller units from your supernet. Select the supernet, input your calculated prefix length, and let the software automatically generate the boundaries.
Apply Variable Length Subnet Masking (VLSM): For maximum efficiency, assign different mask sizes to different subnets (e.g., a /24 for standard users, but tight /30 subnets for point-to-point router links). Phase 4: IP Asset Documentation & Maintenance
Properly cataloging status updates directly prevents connection overlap or duplicate IP faults. IP Planning Explained: Your Guide to Getting Started
Step 1: Begin With Discovery and Assessment Before you assign a single IP address, take a step back and map out what exists today. NetBox Labs Subnetting Tutorial Guide – What is Subnet? – DNSstuff
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