Network Segmentation for Councils: Limiting Ransomware Spread Across Council Systems
When ransomware hits a poorly segmented council network, it spreads rapidly — jumping from an infected laptop to the revenues and benefits system, the social care database, and the council's financial systems within hours. Network segmentation — dividing the council network into isolated zones — limits this lateral movement, giving the council time to detect and contain attacks before catastrophic damage occurs.
Network segmentation limits ransomware lateral movement — councils with segmented networks contain attacks faster and recover more quickly than those with flat network architectures.
Why Council Networks Are Difficult to Segment
Local authority networks have evolved organically over decades, with legacy systems integrated into flat network architectures that were never designed with security in mind. Revenues and benefits systems, social care databases, planning portals, and leisure management platforms may share network segments with general office PCs. Segmentation requires careful planning to avoid disrupting legitimate system integration.
A Practical Segmentation Approach for Councils
A practical council segmentation strategy should prioritise:
- Separating sensitive data systems (revenues and benefits, social care) from general office networks
- Isolating OT systems (building management, CCTV, access control) from IT networks
- Creating a DMZ for internet-facing services (council website, online payments)
- Implementing privileged access workstations for administrative functions
- Restricting lateral movement through firewall rules between segments
Frequently Asked Questions
Can a council implement network segmentation without replacing its entire network?
Yes — segmentation can be implemented incrementally using VLANs and firewall rules on existing network hardware, without wholesale replacement. Start with the highest-value targets: segment your revenues and benefits system, social care database, and financial systems first. Document what traffic is legitimate between segments and block everything else.
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