Choosing a firewall requires more than a model name or port count. Real traffic, enabled security services, VPN load, user and device counts, internet links and growth plans should be evaluated together.
Maximum throughput figures in datasheets may not represent real project performance when multiple security services are enabled. Internet speed should be evaluated together with concurrent sessions, application traffic, SSL inspection and VPN load.
Services such as IPS/IDS, web filtering, application control, DNS security, anti-malware and SSL inspection consume appliance resources. The features that will actually be enabled should be defined early.
For site-to-site VPN, remote-access VPN and multi-site designs, tunnel count, user count, authentication and MFA requirements affect sizing.
If high availability is required, appliance pairs, connectivity and failover scenarios should be designed separately. Sizing should include reasonable headroom for expected growth.
Actual sizing, licensing, security or architecture decisions should be based on the existing environment, vendor support conditions and project requirements.
No. The guide explains general evaluation criteria. Actual product, license or architecture decisions should be based on the existing infrastructure and a requirements assessment.
User/device counts, current products or infrastructure, capacity, license terms and expected growth information can speed up the quotation process.
The guide is based on evaluation criteria used by Doz Teknoloji's technical team when reviewing enterprise firewall and network-security requirements.
About Doz TeknolojiSizing is reviewed across real traffic, enabled security services, VPN, SSL inspection, session capacity, interfaces, HA and growth headroom. The guide is cross-checked against NIST, CISA and vendor technical documentation.
The purpose is to help teams avoid selecting a firewall only by internet speed and instead consider real capacity requirements while security services are enabled.
Primary sources and firewall-sizing criteria were reviewed again.
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