Prerequisites

The below highlights the prerequisites required to use HALB:

• Firewall or router in front of a HALB configured to preserve the source IPs of client devices

Sizing recommendations

Traffic Profile

Concurrent TCP Sessions

Recommended vCPUs

Recommended RAM

Notes

Low-intensity payloads	Up to 12,500	2 vCPUs	2 GB	Safe and stable for small payloads and low send frequency
Moderate-intensity payloads	Up to 12,500	4 vCPUs	2–4 GB	Provides headroom and improved CPU efficiency under sustained load
Moderate-intensity payloads	Up to 20,000	8 vCPUs	4 GB	Required to avoid CPU saturation at high concurrency
All profiles (general guidance)	Any	—	4 GB (preferred)	4 GB RAM provides additional safety margin and resilience during prolonged high-load operation