Lisäpalomuuria

Lisäpalomuuria is a Finnish term that translates to "additional firewall" or "secondary firewall." It refers to the implementation of a second or multiple firewall systems within a network infrastructure, beyond the primary perimeter firewall. This layered approach to network security is often employed to enhance protection against a wider range of threats and to create more robust security zones.

The purpose of a lisäpalomuuria is to provide defense in depth. While a primary firewall might protect the network boundary from external attacks, additional firewalls can segment internal networks, protect critical servers, or act as a backup in case the primary firewall fails or is compromised. These secondary firewalls can enforce stricter access control policies for sensitive internal resources or monitor traffic between different departments or security domains within an organization.

Lisäpalomuuria can be implemented in various ways. This might include placing firewalls at the entrance to specific network segments, such as a database server farm or a development environment. They can also be deployed as internal firewalls to control traffic flow between different VLANs or subnets. The configuration and rulesets of these additional firewalls are typically tailored to the specific security requirements of the segment they protect. The adoption of a lisäpalomuuria strategy is a proactive measure to mitigate the impact of security breaches that might bypass the initial perimeter defenses.