Replacing an Ageing Firewall Without Interrupting Business

The challenge

An ageing firewall had become a reliability and security concern. The business depended on internet access for ERP, banking, email and supplier coordination, so a prolonged cutover was not acceptable.

Our approach

Astek documented the existing WAN links, NAT rules, VPNs, internal subnets and business-critical applications, then prepared a staged migration plan with rollback readiness.

What Astek implemented

• Mapped existing firewall rules and removed obsolete entries before migration.
• Deployed a next-generation firewall with IPS, web control and secure VPN capabilities.
• Recreated only validated business rules instead of blindly copying the old policy set.
• Scheduled cutover around business operations and tested critical applications immediately after migration.
• Established a process for future policy changes and configuration backup.

Business outcome

The company moved to a modern security gateway with minimal disruption, cleaner policies and improved control over internet and remote access. The migration also gave management a better understanding of which rules were genuinely required.