Network Security for Business Systems

Every business that uses the internet, email, or shares data between offices is exposed to security risks — regardless of size. Network security is not just about having a firewall device; it is about a holistic approach covering network segmentation, access control, traffic visibility, and correctly defined policies.

Codex Media designs and implements security solutions at CCIE level — without generic templates. Every project starts with an analysis of the real environment and ends with a solution that can be maintained long-term, without hidden complexity.

What it includes

next-generation firewall (NGFW) implementation
network segmentation and VLAN architecture
access control per user, device and location
site-to-site and remote access VPN solutions
security auditing and infrastructure review
centralized management of security policies
IDS/IPS and application-layer filtering
documentation and operational maintenance guidelines

Problems it solves

flat network — all devices see each other
no control over who accesses which systems
poor or no visibility into network traffic
employees connecting from unprotected locations without VPN
firewall exists but is not configured for actual needs
no active monitoring or anomaly alerts
a security incident has occurred or is suspected

Typical scenarios

Office with 50 employees

The company uses a single ISP, a flat network with no segmentation, and a shared-password VPN. We deploy an NGFW, segment the network into zones (employees, guests, servers, IoT), set up individual VPN access, and enforce policies that block unauthorized lateral traffic — all without an outage longer than one working afternoon.

Multi-site company

Headquarters in one city, two branch offices, and several remote workers accessing the ERP system. We design site-to-site VPN tunnels between locations, centralize security policies, and ensure each site has its own protection with access only to the resources it actually needs.

After a security incident

The company has suffered a ransomware attack or noticed suspicious traffic. We perform forensic analysis of network traffic, identify the entry point, implement immediate isolation measures, and build a long-term security solution that prevents the same attack vector from recurring.

How we work

Every project starts with an assessment of the current state — no assumptions. We map traffic, identify vulnerabilities, talk with the people responsible for IT, and only then propose a solution that matches real operational requirements.

Implementation is planned to minimize disruption. Where possible, configuration is prepared in advance and applied in a single maintenance window. After implementation we deliver documentation and recommendations for ongoing operational management.

Where it is used

business offices and open work environments
companies with multiple locations and remote staff
industrial and logistics environments with IoT devices
organizations with compliance requirements (GDPR, NIS2, ISO 27001)
environments requiring high availability and redundancy
systems that have already experienced a security incident

Frequently asked questions

I have antivirus on all computers — why do I also need a firewall?

Antivirus protects endpoint devices from known threats. A network firewall controls what enters and leaves your network at the infrastructure level — regardless of which device or user is involved. Together they form a layered security model that is significantly more resilient than either tool alone. A firewall can block malware communication with a command & control server even when antivirus has not yet detected the threat.

How long does implementation take?

For a typical single-site office — from analysis to final configuration, usually 3 to 10 working days, depending on complexity and the current state of infrastructure. Implementation is scheduled to minimize disruption. More complex scenarios with multiple locations or legacy systems may require longer planning, but we always work within a clear timeline.

Can it be done without downtime?

In most cases, yes. Configuration is prepared in advance, tested in an isolated environment, and applied during an agreed window — typically outside business hours or on a weekend. For critical systems we plan failover scenarios so there is a fast rollback path if needed.

Who is this for?

Any company that takes the protection of its data and systems seriously — from 10 to 500+ employees. Especially relevant for businesses handling sensitive client data, carrying regulatory obligations, or having already been exposed to security incidents. Company size is not a barrier — we adapt the approach to actual needs and budget.

What if I have multiple sites or branch offices?

Multiple sites mean more entry points for attackers — but also more opportunity for proper segmentation and centralized control. We design site-to-site VPN architectures that give all locations secure access to shared resources, with centralized policy management from a single point. See also our SD-WAN solutions which further optimize traffic between locations.

How much does it cost?

Cost depends on the size of the infrastructure, the number of sites, and the selected equipment. We do not produce generic quotes — every project is assessed individually. Contact us with a brief description of your infrastructure and you will receive a concrete estimate without unnecessary complexity. Consider our security audit as a starting point for organizations that want to understand their current posture before investing.

Related services

Security audit·SD-WAN solutions·Cloud centralization·VPN & remote access

Request an assessment

Send us a brief description of your infrastructure — company size, number of locations, existing equipment. No standard offers, no unnecessary complexity.