Cloud firewalls – rule-based protection

Cloud firewalls: Protection through a set of rules

Protect VMs and clusters with centrally managed firewall rules – configured in minutes, effective from the very first second.

  • Centralised rule management for any number of servers
  • Incoming & outgoing rules by ports, protocols and sources
  • Effective immediately – Changes take effect without a restart
  • At no extra cost for your ccloud³ infrastructure
ccloud³ Console · Cloud Firewall
eu-de · Hallstadt Data Centre
Firewall
web-fw
Rules
12 active
Server
5 protected
IN Inbound: 80/443 from anywhere
● Permitted
SSH Inbound: 22 admin network only
● Restricted
OUT Outbound: defined objectives
● Filtered
DENY Everything else
● Blocked
Rule adoptedEffective on 5 servers · immediately
Security through a set of rules

Network protection that you control yourself

Cloud firewalls filter traffic to your servers at the network level – before it reaches the operating system. Managed centrally via the ccloud³ Console.

Rule-based filtering

Define permitted ports, protocols and source IP addresses for incoming and outgoing traffic – everything else will be reliably blocked.

Central to many servers

A firewall definition protects any number of VMs: new servers adopt existing rule sets at the click of a button.

Real-time changes

Rule changes take effect immediately and without the need to restart – ideal for responding quickly to new requirements or threats.

Protection from the system

Filtering takes place at network level before packets reach your servers – this reduces the load on your systems and minimises your attack surface.

Part of your security strategy

From basic protection to a multi-tiered approach

Cloud firewalls form the first line of defence for your infrastructure. Combined with Virtual Private Cloud for isolated networks, the Managed Firewall for managed perimeter protection and cProtect for ransomware protection, this creates a multi-layered security approach tailored to your needs.

active straight awayKey rules · Real-time changes
About the Managed Firewall for managed protection
  • Centralised rule management for any number of servers
  • Incoming & outgoing rules by ports, protocols and sources
  • Effective immediately – Changes take effect without a restart
  • At no extra cost for your ccloud³ infrastructure
An overview of typical regulatory frameworks

Protective profiles for common scenarios

Start with a tried-and-tested profile and refine the rules to suit your requirements.

Web server
HTTP/HTTPS
Price
on request
For websites and APIs
  • 80/443 public
  • SSH admin network only
  • Remaining amount blocked
Database
Back-end
Price
on request
For internal services
  • Access from VPC only
  • No public port
  • Filtered by default
Personalised
Made to measure
Price
on request
For complex set-ups
  • Custom port profiles
  • IP whitelisting
  • Different rules for each environment
Firewall as a Service – Costs and Scope

How much does a cloud firewall cost at centron?

The Cloud Firewall is available free of charge via centron’s self-service portal: you can create rules at no extra cost; 100 rules per firewall are included, and internal traffic is not charged for. If you’d prefer to hand over management, you can book the Managed Firewall for €54.94 per month – centron will then take care of setting up, maintaining and customising the rules. The firewall operates on a rule-based system in front of the virtual machine, ensuring that unwanted traffic never reaches the system in the first place. It is operated in certified to ISO 27001 on the basis of IT-Grundschutz data centres in Germany with an unrestricted BSI C5:2020 Type 1 certificate.

An overview of firewall options
PerformancePrice
Firewall rules in self-service€0.00 – included in the Cloud plan
Rules per firewall100 included
Managed Firewall (operated by centron)€54.94 per month
Internal traffic€0.00 / GB
External traffic€0.001 / GB
Success stories

How our customers manage their IT

Echte Praxisbeispiele von Kunden, die ihre IT-Infrastruktur mit centron neu aufgestellt haben – von Skalierung unter hoher Last über sichere Datenverarbeitung bis zur Kostenoptimierung.

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Immediate protection – Rules take effect without a restart
Centralised control – a set of rules for many servers
Less to be criticised – Filtering before the operating system
Complete flexibility – can be adjusted at any time via the console
Cloud Firewalls FAQ

Everything you need to know about cloud firewalls

What is a cloud firewall?

A rule-based network filter that controls traffic to your ccloud³ servers before it reaches the operating system. You define centrally which ports, protocols and sources are permitted – everything else is blocked.

How do cloud firewalls differ from managed firewalls?

You manage cloud firewalls yourself via the console – ideal for teams with in-house expertise. With the Managed Firewall, centron’s experts handle rule sets, monitoring and maintenance as part of the service.

Can I use a firewall for several servers?

Yes. A firewall policy can be assigned to as many servers as required. New VMs adopt the policy with a single click – ensuring that protection remains consistent, even as the environment grows.

How quickly do rule changes take effect?

Immediately. Changes are applied in real time to all assigned servers – without the need to restart and without interrupting active connections, which remain permitted.

How much does the cloud firewall cost?

Cloud firewalls form part of your ccloud³ infrastructure and can be used at no extra cost – effective basic protection comes as standard with centron.
Practical exercises from the tutorials

Securing servers

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