Split-Horizon DNS: One Name, Two Answers, and the Server Decides by Who's Asking

Short summary

A hands-on networking lab from the Protocol Lab series that demonstrates split-horizon DNS using BIND9 views in a containerlab environment. The authoritative server returns different IP addresses for the same hostname based on the client's source address — internal clients get a private IP, external clients get a public IP. The lab includes topology diagrams, BIND configuration, verification commands, and references to relevant RFCs.

• •Split-horizon DNS serves different answers for the same name based on client source address
• •Lab uses BIND9 views with match-clients in a containerlab topology with internal and external clients
• •Includes RFC references, step-by-step deployment, and verification commands

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