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This post explains how to use Boundary's Preferred Endpoint feature to control which IP address is selected when connecting to multi-homed hosts in dynamic infrastructure.
•Dynamic host catalogs automatically sync with cloud providers (AWS, Azure, GCP) to discover hosts via tags, replacing manual IP management
•Multi-homed hosts (e.g., AWS EC2 instances) can have multiple IPs across different network interfaces, causing session routing failures
•By default, Boundary prioritizes addresses in this order: Private IPv4, Public IPv4, DNS, Private IPv6, Public IPv6
•Preferred endpoints can be configured using CIDR blocks (e.g., cidr:10.0.0.0/16) or DNS glob patterns (e.g., dns:*.internal)
•Configuration is supported via UI, CLI, or Terraform using the boundary_host_set_plugin resource's preferred_endpoints argument
This summary was automatically generated by AI based on the original article and may not be fully accurate.
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