Every week we meet Chennai businesses running ₹3,000 routers as their only defence — or the opposite: paying for enterprise firewalls three sizes too big. This guide covers what actually matters when buying a business firewall in India in 2026.

Start with users and bandwidth, not brand

Firewall sizing is driven by two numbers: concurrent users and internet bandwidth. A 200 Mbps leased line with 40 users needs very different hardware than 1 Gbps with 300 users — especially once you enable SSL inspection, which can cut rated throughput by 60–80%. Always size against the vendor's threat protection throughput, not the headline firewall throughput.

Quick sizing reference

  • 5–50 users: FortiGate 40F/60F, Sophos XGS 87/107, SonicWall TZ-270/370 — roughly ₹35,000–₹90,000 with first-year security bundle
  • 50–300 users: FortiGate 100F, Sophos XGS 2100/2300, Cisco Firepower 1100 — roughly ₹1.5L–₹4L
  • 300+ users / campus: FortiGate 400F+, Palo Alto PA-1400, Checkpoint Quantum, deployed in HA pairs

The license is the product

A firewall without its security subscription is just an expensive router. Budget for the UTM bundle — IPS, web filtering, anti-malware, sandboxing (FortiGuard, Sophos X-Ops, SonicWall AGSS) — and prefer 3-year licenses, which typically save 25–35% versus annual renewal.

Five mistakes we fix most often

  • Buying grey-market imports with no India warranty or registerable license
  • Skipping SSL inspection sizing — the firewall chokes the day it's enabled
  • No HA pair for businesses where internet downtime stops billing
  • Default outbound-allow-all policies left in place after installation
  • Letting licenses lapse — protection silently stops while traffic keeps flowing

Fortinet vs Sophos vs SonicWall — honest take

Fortinet offers the best price-to-performance and the widest ecosystem (switches, APs, SASE) — our most-deployed brand. Sophos wins on management simplicity and tight integration with its endpoint/MDR stack — ideal when one team manages everything. SonicWall remains a value leader for small offices. All three protect well when correctly sized, configured and licensed — which is where an authorized partner earns its keep.

Get it sized professionally — free

As an authorized Fortinet, Sophos, Cisco, Palo Alto and SonicWall partner in Chennai, Invitty will size your firewall against your real traffic, quote same-day with GST invoice, and deploy with certified engineers. See our firewall solutions →