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Cyber Security
HEIMWALL Fully developed by Netinternet, protect against cyber attacks with our Web Application Firewall solution Explore Now →
AntiDDoS High-capacity volumetric Anti-DDoS protection provided free by default on all our services Explore Now →
VPN Solutions Secure, encrypted tunnel connections for your remote offices and employees with our managed VPN solutions Explore Now →
Layer4 Stateless Firewall Layer4 stateless firewall solution for filtering and directing incoming traffic Explore Now →
SSL Certificates Secure connection solutions with free and paid SSL/TLS certificate options Explore Now →
Penetration Tests Penetration tests performed by third parties in cooperation with TSE-approved testing firms Explore Now →
Corporate Email
Corporate Email Solutions Fully domestic, KVKK compliant, 100% compatible with Outlook and all mail programs, professional, uninterrupted email service Explore Now →
Bulk Email Sending Manageable bulk email sending services with high delivery rates for your marketing campaigns Explore Now →
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Domain Registration Services Domain registration and easy management at the most affordable prices in all popular extensions (.com, .net, .org, etc.) Explore Now →
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Hosting & Cloud Service Providers High-density infrastructures, multi-tenant architectures and SLA-focused sustainable data center solutions for hosting and cloud providers Explore Now →
E-Commerce Companies High-performance, secure and uninterrupted e-commerce infrastructures resilient to sudden traffic surges during campaign periods Explore Now →
Software Developers Developer-friendly infrastructure solutions with CI/CD compatible, API-supported, automation-ready flexible resource management Explore Now →
SaaS Providers Scalable, high-availability and continuity-focused cloud infrastructures suitable for SaaS architectures serving many users. Explore Now →
AI & R&D GPU-based high-performance and scalable infrastructures for big data processing, model training and high computation tasks Explore Now →
Agencies & Marketing Multi-client management compatible, quick setup, high-performance and flexible web hosting infrastructures Explore Now →
Media & Broadcasting High bandwidth and low latency infrastructure solutions for live streaming, video and heavy content traffic Explore Now →
Banks & Fintech Regulation-compliant, Tier-3/Tier-4 standard, highly secure financial infrastructures ensuring uninterrupted service Explore Now →
Government & Education Long-term, sustainable and secure infrastructure solutions compliant with regulations and data security requirements Explore Now →
Manufacturing / Industry Low-latency and high-availability infrastructure solutions compatible with Industry 4.0, IoT and production automation systems Explore Now →
Healthcare Organizations Highly secure and uninterrupted health informatics infrastructures prioritizing patient data privacy and continuity Explore Now →
HEIMWALL – Web Application Firewall Protect your web applications against advanced attacks with our 100% domestic WAF platform HEIMWALL Explore Now →
Ilkbyte - Cloud Server Service Scalable and high-performance cloud servers deployable in seconds with our domestically developed orchestration infrastructure Explore Now →
Netrafix - Bandwidth Monitoring Manage 5651 compliant logging and bandwidth billing (Burst, Traffic Quota, 95th Percentile) in one platform with sFlow, NetFlow and IPFIX supported Netrafix Explore Now →
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DirectIP - IP Management System 100% domestic IP management platform developed by Netinternet for centralized IP address, subnet, VLAN and DHCP management Explore Now →
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Our Physical Data Center
Our Physical Data Center Our corporate data center facility designed with high security standards and redundant power and cooling infrastructure Explore Now →
Power, Cooling, Security Facility architecture designed for critical infrastructures with redundant power lines, climate systems and multi-layered physical security Explore Now →
Internet Access Points Low-latency and high-availability backbone connections through multiple operators and internet exchange points Explore Now →
Network Infrastructure
Network Infrastructure Uninterrupted connectivity infrastructure with multi-carrier connections, redundant backbone and high-capacity network architecture Explore Now →
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Our Certifications We provide auditable and sustainable infrastructure standards with our certifications for information security and service continuity Explore Now →
Security Policy We ensure protection of infrastructure and data with our security policies covering information security, access control and risk management Explore Now →
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Service Management Policy Our policies and standards governing IT service management processes within the scope of ISO/IEC 20000-1. Explore Now →
Business Continuity Policy Our ISO 22301 compliant policies and procedures ensuring business continuity against possible outage scenarios. Explore Now →
Incident Management Policy Our incident management processes and action plans for the detection, response and resolution of security incidents. Explore Now →
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Free on All Services

Layer4 Stateless Firewall

Layer4 Stateless Firewall, offered free of charge on all services hosted in Netinternet's data center infrastructure, allows you to filter inbound network traffic by IP, port and protocol through your control panel—without creating any support ticket. By redirecting your selected IP prefix to a different device on the internal network, you can meet your instant security needs on a self-service basis.

Layer4 Stateless Firewall

Free Network Security, Full Control

Layer4 Stateless Firewall is available free of charge and active on all server and colocation services within the Netinternet infrastructure. You can instantly create your inbound traffic rules through your control panel and manage your network security with your own hands without requiring any technical support process.

Free Service

You can benefit from Layer4 Stateless Firewall on all your services within the Netinternet infrastructure without paying any additional fee. There are no activation, license or capacity limits.

Self-Service Management

No need to create a support ticket. You can instantly define, edit or remove your own rules through the Netinternet control panel.

Inbound Traffic Control

Layer4 Stateless Firewall is designed for filtering inbound traffic. By defining simple yet effective rules based on IP, port and protocol, you can control the traffic reaching your server.

Technical Specifications and Capabilities

High-performance, low-latency filtering infrastructure that evaluates each packet independently thanks to its stateless architecture.

Line-Speed Packet Processing

Each packet is evaluated independently with no connection table maintained. This enables line-rate packet processing and preserves your network performance.

IP & Port-Based Filtering

Define detailed traffic filtering rules based on source/destination IP address and port number. Blocking traffic from specific IP addresses or allowing access only to specific ports is entirely under your control.

Protocol Filtering

Tighten your network security by creating traffic rules based on protocols such as TCP, UDP and ICMP. Minimize your attack surface by disabling protocols you don't need.

IP Prefix Redirection

By redirecting your selected IP prefix to a different device on the internal network, you can route incoming traffic through the point where your firewall rules are applied. This eliminates the need for any changes to your existing infrastructure.

Control Panel Management

Easily add, edit or delete your rules through the Netinternet control panel. Apply your own security policies instantly without the need for any technical support request.

Scalable Architecture

Infrastructure that scales without performance loss despite increasing traffic volumes and rule counts. As your business grows, your firewall scales seamlessly.

How Does It Work?

Free inbound traffic filtering in 3 steps

1

IP Prefix Selection

Select the IP prefix you want to apply filtering to from your control panel. The selected prefix is redirected to the device you specify on the internal network, creating a traffic filtering point.

2

Rule Definition

Create your allow or block rules based on IP address, port number and protocol for inbound traffic. Your rules take effect instantly—no support ticket required.

3

Instant Filtering

Incoming packets matching your defined rules are forwarded to your server; non-matching packets are instantly dropped. Thanks to its stateless architecture, it operates with microsecond-level latency.

Free
On All Services
100G+
Processing Capacity
<1μs
Packet Processing Time
7/24
Self-Service Access

Layer4 Firewall Advantages

Offered free of charge, Layer4 Stateless Firewall is a simple and effective self-service security solution designed to meet your instant security needs.

Zero Cost, Full Access

Layer4 Stateless Firewall is ready to use on all your services in the Netinternet infrastructure at no additional cost. There are no license fees, activation charges or capacity limits. Regardless of your business size, you have access to enterprise-grade network security.

Instantly Activated Rules

Rules you define from your control panel take effect immediately without any approval process. In emergency security situations, you can intervene within seconds without waiting for the support team.

Natural Resilience Against DDoS

Thanks to its stateless architecture, no connection table is maintained, providing natural immunity against state-exhaustion attacks. No performance loss even under heavy traffic.

Simple and Clear Rule Structure

Create easily manageable rules with clear parameters such as source IP, destination IP, port and protocol. Take effective control of your network security without the need for complex configurations.

Use Cases

In which scenarios is Layer4 Stateless Firewall ideal?

Server Front-Layer Protection

Provides front-layer filtering to block unwanted incoming traffic on your dedicated and VDS servers. Protect your server against external threats by instantly blocking specific IP addresses or port ranges.

Emergency Security Response

When you notice a suspicious traffic source, respond instantly from your control panel without waiting for a support ticket. Protect your service continuity by blocking specific IPs or port ranges within seconds during an attack.

High-Traffic Environments

In game servers, streaming platforms and high-traffic applications, the stateless architecture provides protection by filtering incoming traffic without any performance loss.

Request Information

Frequently Asked Questions

Common questions about Layer4 Stateless Firewall

What is Layer4 Stateless Firewall and how does it work?

Layer4 Stateless Firewall is a security firewall solution that operates at layer 4 of the OSI model and evaluates each packet independently. It does not maintain connection state information; it processes each incoming packet as allow or block according to your defined rules (source IP, destination IP, port, protocol). Through the Netinternet control panel, you can redirect your selected IP prefix to a different device on the internal network and apply simple yet effective filtering rules on your inbound traffic. This service is offered free to all Netinternet infrastructure customers.

Is this service really free? Are there any limitations?

Yes, Layer4 Stateless Firewall is offered completely free on all services within the Netinternet infrastructure. There are no activation fees, license costs or capacity-based charges. The service is designed for filtering inbound traffic only. No rules are applied to outbound traffic. For both inbound and outbound traffic control or more specific firewall needs, please contact us about our customizable firewall solutions.

Can outbound traffic also be filtered?

Layer4 Stateless Firewall is designed for inbound traffic filtering only and does not apply rules to outbound traffic. However, as Netinternet, we offer more comprehensive and customizable firewall solutions that provide both inbound and outbound traffic control. You can contact our technical team for solutions suited to your needs, including IPS Firewall, hardware firewall and managed security services.

How can I manage rules? Is a support ticket required?

No, a support ticket is not required. You can create, edit or delete your Layer4 firewall rules 24/7 through your Netinternet control panel. Your rules take effect instantly. The panel interface is designed to be simple and intuitive to use without requiring technical expertise. However, if you need help with anything, our technical support team is always available.

What is the difference between stateless and stateful firewall?

Stateless firewall evaluates each packet independently and does not maintain connection state information. This approach provides high performance and low latency. Stateful firewall maintains a connection table and evaluates packets in the context of the connection, offering more detailed control but consuming more system resources. Layer4 Stateless Firewall is ideal for instant and fast inbound traffic filtering needs. For more advanced stateful firewall and IPS solutions, please contact us.

I need more comprehensive security solutions. What does Netinternet offer?

Netinternet offers a wide range of security solutions beyond Layer4 Stateless Firewall. We have solutions tailored to your enterprise needs, including hardware firewall and IPS solutions with both inbound and outbound traffic control, Web Application Firewall (HEIMWALL), AntiDDoS protection, VPN solutions, penetration testing and managed security services. Simply contact our technical team to analyze your business security needs and design the most suitable solution.