FAQ

Is this a subnet calculator or an IP plan generator?

This is a greenfield IP plan generator for new sites / new customers / new labs. It produces a clean, repeatable VLAN + subnet plan you can deploy consistently.

• Yes: VLAN planning, sizing, consistent patterns, export.
• No (v1): fixing existing networks, importing random 192.168.x.x, multi-site projects, auto-detecting used subnets.

IP addressing scheme for multiple sites: why “one site = one /16” (10.<site-id>.0.0/16)?

It guarantees no overlap between locations, keeps routing simple, and scales without redesign. VLAN subnets live inside the site’s /16, so your IP plan stays predictable and readable.

Guest VLAN isolation

Guest is still created (and included in CLI/export). It’s flagged as isolated so you can keep it out of IPsec routing. Real isolation is enforced on your firewall (zones/policies).

Subnet sizing rules (/24 vs /23 vs split)

• Up to ~254 devices → /24
• Up to ~510 devices → /23
• Above that → split into multiple /23 segments by default
• You can optionally override to a larger subnet (/22+) with warnings

Best practice: smaller broadcast domains are usually healthier. Large L2 segments can increase broadcast/multicast noise.

IPsec-friendly routing and handover

Because every site gets a dedicated /16, your IPsec selectors and routes stay consistent. You can route “site-to-site” cleanly without overlapping private ranges.

Vendor CLI templates / configuration generator (Technical Preview)

CLI generation is a preview feature. It outputs copy/paste templates (no secrets). Always review before applying on production devices.

• FortiGate: VLAN interfaces + optional zones/DHCP/policies
• HP Aruba 2530: VLANs + tagged/untagged ports (switch-side)

Roadmap / Pro ideas

• Beta: more vendor templates, better DHCP ranges per segment, printable diagrams
• Pro: multi-site projects, saved designs, share links, more deployment presets