Managed Firewall

Define which connections are allowed and who maintains the rules.

A managed firewall applies controls between networks within agreed scope. To delegate operations, start with necessary flows and change approval.

Scope, logs, changes, high availability and shared responsibilities must be defined.

Let’s talk

Two digital guardians outside an office: one diverts suspicious packets and the other lets legitimate traffic through.

How it works

Turn security policy into rules that can be operated and reviewed.

Internal zones

Managed firewall

Rules and sessions

Authorised destinations

Who can communicate with whom

Define zones, sources, destinations and applications. The firewall applies policy to traffic crossing it; NAT and VPN belong only where included in the design.

Managed does not mean the provider knows every business permission. Assign a rule owner, change approval and exception review.

Internal zones

Managed firewall

Inspection and capacity

Authorised destinations

Measure with inspection enabled

Useful throughput and latency depend on traffic, sessions and enabled controls. Review logs, resources and rule matches before disabling protections for a slow application.

Distinguish a correct block from a false positive. An exception needs a reason, scope and review, not a permanently open rule.

Internal zones

Managed firewall

Control continuity

Authorised destinations

Keep security during recovery

A device pair and session synchronisation may form part of a high-availability design. Validate routes, power and behaviour when a node fails.

Test legitimate access and rejection of unauthorised traffic after failover. A bypass allowing everything does not restore protection.

Illustrative case: from situation to decision

Situation: A new site needs one application without opening access to the rest of the network.
Option: Define source, destination and service, with approval and rollback owners.
Check: Test the permitted flow and access that must stay blocked; review logs.

Inspection features, firewall location and high availability depend on the contracted service.

Decisions for your project

Policy: Zones, flows, NAT/VPN and each rule’s owner.
Sizing: Sessions, inspected throughput, logs and agreed retention.
Operations: Changes, escalation, high availability and tests using the same policy.

From design to operation

Review rules and dependencies; migrate with permitted/rejected flow tests and controlled rollback.

Complements, alternatives and variants

DDoS MitigationComplementMitigates saturation before the perimeter.Colt SSEComplementExtends controls to users and applications outside the site.

Product sources

Colt Managed Firewall · new tab

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What happens next?

Understand the context
What’s changing, where your teams work and what cannot fail. Still defining the brief? We can help structure it.
Design the options
Bring needs, Colt capabilities and technical criteria together. Compare alternatives and explain dependencies and limits.
Validate before committing
Coverage, feasibility, responsibilities and terms. A commercial proposal is developed with the relevant specialists.

ColtPlatinum guides the project and coordinates commercial discussions and follow-up. Colt validates feasibility, enters into the service contract, and provisions, installs and delivers the services.

Availability, coverage, capabilities, SLAs and timelines are subject to technical validation and contract. No diagram is a service guarantee.