Count users, devices and traffic
Include office users, servers, guest devices, remote users, branch links and expected growth.
Security guide
How to Size a Firewall for Users, VPN and Security Services
Firewall selection should use inspected throughput, concurrent sessions, VPN demand and security subscriptions—not only the internet-line speed.
List the security functions
Threat prevention, web filtering, SSL inspection, application control and sandboxing can reduce effective throughput.
Define availability and interfaces
Specify high availability, WAN links, fibre or copper ports, PoE, rack format and power requirements.
Choose the subscription and support term
Hardware-only, security bundles, support and renewal periods have different commercial and operational effects.
Frequently asked questions
Is internet speed enough to size a firewall?
No. Inspected throughput, sessions, VPN traffic, security features and growth must also be considered.
Can an existing firewall license be renewed?
Usually yes, subject to the product lifecycle, serial number and publisher rules.