automatically assign and manage ip addresses to avoid ip address conflicts
An IP address conflict occurs when two interconnected network locations use the same IP address range (such as a subnet or specific IP segment). Without special handling, this prevents normal network communication or connection establishment. Before deploying applications, plan and design IP addresses to avoid IP address conflicts.
Priority
Chinese
Practices to Avoid
Using the same CIDR block in multiple VPCs
Using the same IP range for a VPC and an on-premises network (such as a data center network)
Using reserved CIDR blocks. Cloud providers typically use some reserved CIDR block addresses to provide cloud services. Using reserved CIDR blocks prevents access to these cloud services.
Implementation Guide
Use IP Address Manager (IPAM) service
Use Alibaba Cloud IPAM to centrally manage CIDR allocation for all VPCs, subnets, and on-premises networks.
Collect CIDR information for existing VPCs and subnets through the API or console to detect potential conflicts.
When creating new VPCs or subnets, select conflict-free CIDR blocks based on IPAM allocation recommendations.
Plan CIDR Ranges Effectively
Avoid overly large or small CIDR blocks: Select appropriate CIDR block sizes to prevent address waste or limit future extension.
Reserve address space: Reserve sufficient CIDR ranges for potential future network extension.
Ensure no overlap: Ensure that CIDR blocks do not overlap between VPCs, on-premises networks, and cross-cloud environments.
Address Existing IP Overlap Issues
Migrate to a new CIDR range: If possible, migrate overlapping networks to new, conflict-free CIDR ranges.
Use NAT Gateway: When connecting overlapping networks, use NAT Gateway to transform addresses.
Adopt PrivateLink: Use PrivateLink technology to achieve secure cross-network communication without directly exposing IP addresses.