Migrating from a dynamic IP address system (DHCP) to static IP addresses on a working Internet Service Provider (ISP) network is a process that requires careful planning to minimize service interruptions to customers.

We leave you a general procedure that you could follow, keeping in mind that technical specifications may vary depending on the equipment and exact network configuration you are using.

1. Planning and Preparation

• Analyze customer needs: Determines which clients need static IP addresses and why. This could include servers hosting web pages, email services, VPNs, etc.
• IP address reservation: Make sure you have enough static IP addresses available for your clients. Consider future network expansion.
• Communication with customers: Inform your clients about the change in advance, including the estimated time for the migration and instructions if they need to make changes on their end.

2. ISP Side Configuration

• Configure the pool of static IP addresses: In your network management system or directly on the devices, as appropriate.
• Implement changes in phases: If possible, perform the migration in phases, group by customer group or area by area, to minimize the impact.
• Update DHCP policies: You may need to update your DHCP settings to exclude assigned static IP addresses from the dynamic pool.

3. Assignment and Migration

• Assign static IP addresses: Assigns static IP addresses to selected clients. This may require manual configuration on the customer's computer or instructions for them to configure it themselves.
• Active technical support: Have a technical support team available to help customers with the migration, especially if they need to make configuration changes to their devices.

4. Testing and Verification

• Check connectivity: Ensure that migrated clients have full access to the Internet and required services with their new static IP addresses.
• Monitor traffic and network: Observe the network closely during and after the migration to quickly detect and resolve any issues.

5. Documentation and Monitoring

• Update network documentation: Make sure all changes are properly documented for future reference and support.
• Customer feedback: Collect customer feedback to evaluate the success of the migration and to improve future processes.

Additional considerations

• Security- Review and adjust security policies and firewalls to reflect changes in address allocation.
• Network capacity: Make sure your network has enough capacity to handle the expected traffic with the new configurations.

This procedure is intended to ensure a smooth transition from DHCP to static IP addresses with minimal impact on customer service. Ongoing communication, technical support and monitoring are key to resolving any issue quickly.