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docs: operator-facing reference guide for the provisioning network (the layer above the lab walkthrough) #10

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@tjjh89017

The deployment guide being written now is deliberately a step-by-step lab walkthrough: concrete addresses, concrete commands, followable end to end so a manual lab can be built from it and the setup is testable. That is the right first target.

It is not the same document as an operator-facing reference: one that states requirements and options without prescribing a single topology, so a user can map them onto their own network. That layer is deferred on purpose — write it once the walkthrough has proven which parts are essential and which were lab-specific.

What the reference layer should eventually cover, phrased as requirements rather than a recipe:

  • The scenario matrix — existing DHCP on the same L2 (proxyDHCP coexistence), existing DHCP reached by relay, isolated segment with bootd serving leases — and how to tell which one a site is.
  • Network prerequisites the user owns: the provisioning L2 per site, BMC reachability, cluster-to-site L3 baseline.
  • The tracker/seeder connectivity matrix as requirements: targets must reach the announce URL and the seeder BT endpoint, and the address the tracker records must be real (no NAT). Both fulfilments are valid — a routed L3 path to a stable cluster Service address, or attaching tracker/seeder to the target subnet — without declaring one canonical.
  • The full port table (67/4011 DHCP, 69 TFTP, boot config, agent API, 6969 tracker, 16881 BT) and what must reach what.
  • The image contract (bootable images ship their own removable-media bootloader) and the Secure Boot chain.
  • Sizing/scale guidance once real numbers exist.

Written in ASD-STE100 English, same as the rest of docs/.

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