Feature | Stateful | Flow | Proxy |
Inspection unit per session | first packet | selected packets | complete content |
Memory, CPU required | low | medium | high |
Level of threat protection | good | better | best |
Authentication | yes | ||
IPsec and SSL VPN | yes | ||
Antivirus protection | yes | yes | |
Web Filtering | yes | yes | |
Data Leak Protection (DLP) | yes | yes | |
Application control | yes | ||
IPS | yes | ||
Delay in traffic | no | small | |
Reconstruct entire content | no | yes |