---
title: "Network Security: Zero Trust & ZTNA | EFROS"
description: "Zero Trust segmentation, firewall and WAF tuning, VPN-to-ZTNA migration, network detection and response."
canonical: https://efros.com/services/network-security/
---

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By [Stefan Efros](https://www.linkedin.com/in/stefanefros-cyberdefense/), CEO & Founder, EFROS

Updated · August 6, 2026

Service · Network Security

# Network: Zero Trust, not perimeter trust.

Zero Trust segmentation, firewall and WAF tuning, VPN-to-ZTNA migration, network detection and response. The perimeter walked out the door when remote work shipped.

[Run Free Security Score](https://efros.com/free-security-assessment/) [Book a 20-Minute Call](https://efros.com/contact/?type=consultation)

Who this is for

Companies with on-premise infrastructure (offices, branches, warehouses, distribution centers) that need modern network security: next-gen firewall, segmentation, secure remote access, intrusion detection, network logging. Especially relevant after office consolidation or a multi-site expansion.

## Network security program scope

### Segmentation review

Current VLANs, subnets, security zones, and east-west traffic mapped. Recommendations against NIST SP 800-207 (Zero Trust Architecture) and CISA Zero Trust Maturity Model.

### Firewall + WAF tuning

Fortinet, Palo Alto, Cisco, or Cloudflare, depending on your estate. Rule-set rationalization, unused-rule cleanup, geo-blocking review, IDS/IPS signature tuning.

### VPN to ZTNA migration

Cloudflare Zero Trust, Zscaler, Netskope, or equivalent. Identity + device posture replacing network-perimeter trust. Phased rollout with rollback path.

### Network detection + response

Flow logs, DNS logs, and network telemetry shipped to your SIEM. Anomaly detection rules tuned for your environment. Threat intel feeds aligned to your industry.

### Wi-Fi + IoT segmentation

Guest networks isolated from corporate. IoT devices (cameras, printers, HVAC, building management) on their own VLAN with explicit allow-list. Critical for healthcare and manufacturing.

### DDoS posture

Cloudflare or AWS Shield review, regional failover plan, runbook for sustained attacks. Pre-incident relationships with provider SOCs.

What this engagement does not cover

Items below sit outside the scope of this service. Some are handled by separate EFROS engagements; others belong with your existing partners or in-house team.
- ×Network hardware procurement (you own the equipment)
- ×Internet circuit ordering (handled by your telco)
- ×On-site cabling and electrical work (handled by your physical infrastructure vendor)
- ×Wireless RF survey work (separate engagement when needed)

Security impact

Segmentation between corporate, OT, guest, and IoT removes the flat-network exposure that lets a single compromised endpoint reach the file share, the PoS terminals, and the camera network all at once. NGFW + IDS catch the lateral-movement attempts the endpoint EDR can't see.

Compliance & cyber-insurance relevance

Network segmentation is a core control in PCI-DSS v4.0.1 §1 + §11, HIPAA Security Rule §164.312(e)(1), and IEC 62443 (operational technology). Documented segmentation diagrams come out of the engagement as audit-ready evidence.

Standards and frameworks referenced

NIST SP 800-207 (Zero Trust Architecture) CISA Zero Trust Maturity Model CIS Controls v8.1 — Control 12 NIST SP 800-41 Rev. 1 (Firewalls)

Standard versions should be verified from the official source before contractual reliance.

Frequently asked

## Questions before we start.

Do we really need ZTNA? Our VPN works. + Your VPN works for connectivity. It does not enforce device posture or per-application access. The day a compromised laptop connects, your VPN is the attacker's tunnel into the LAN. ZTNA replaces network-level trust with identity-and-device-level trust.

What about our legacy systems that need flat-network connectivity? + Air-gap, segment, or proxy them. Legacy ICS / OT systems get isolated VLANs with explicit gateway controls. Industrial-protocol awareness (Modbus, BACnet, etc.) added to the SIEM.

Will tuning the firewall break anything? + Not if done carefully. Audit mode first (logging-only) for 14 days to catch legitimate traffic that current rules allow. Then enforce. Rollback documented for every change.

## Start with your domain.

Free passive external assessment. 60 seconds. No signup to start.

[Run Free Security Score](https://efros.com/free-security-assessment/) [Book a 20-Minute Call](https://efros.com/book/)

Related EFROS resources

## Related EFROS services

[### Managed Detection & Response 24/7 SOC with pre-authorized containment — the operational layer for any service.Open→](https://efros.com/security/mdr/) [### Virtual CISO Fractional executive security leadership with quarterly board reporting.Open→](https://efros.com/security/vciso/) [### Zero Trust NIST SP 800-207 implementation across identity, device, network, app, data.Open→](https://efros.com/security/zero-trust/) [### AI Governance NIST AI RMF + ISO/IEC 42001 + SR 11-7 operating program.Open→](https://efros.com/services/ai-governance/) [### Full services catalog MSP, MSSP, system integration, AI governance under one accountable SLA.Open→](https://efros.com/services/) [### Security service catalog Complete cybersecurity service overview.Open→](https://efros.com/security/)