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openstack-caracal-dc-dc / docs / changelog-20260711-ula-gen-command-fix.md
@JANeumatrix JANeumatrix 3 days ago 1 KB D-111: align VR1 v6 subcarve to deployed NN mnemonic; fix ULA-gen doc bug
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Changelog 2026-07-11 -- DOCFIX-183: fix invalid ULA-generation command in the netem/ULA proposal

Context. While assigning the org ULA /48 for the VR1 NetBox buildout, the generation command in docs/dc-dc-netem-and-ula-gua-proposal.md section 2.1 (DOCFIX-168) was actually run and produced an invalid IPv6 address (fd42ff:19d97a::/48 -- 6-hex-digit hextets). Root cause: its sed split the 10 hex digits of openssl rand -hex 5 as 4+6 (\1\2:\3\4\5) instead of the 2+4+4 an IPv6 /48 needs (fdXX:XXXX:XXXX).

Fix

  • docs/dc-dc-netem-and-ula-gua-proposal.md section 2.1: sed corrected to s/\(..\)\(....\)\(....\)/\1:\2:\3/ -> fdXX:XXXX:XXXX::/48. Verified: the corrected command emits a valid /48 within fc00::/7.
  • Added a correction note pointing to the ratified VR1 value fd50:840e:74e2::/48 (from docs/dc-dc-netbox-buildout-scope.md 4c); the command is now framed as the reference method, not a VR1 re-generation step.

Verification

  • Ran the corrected command: fdc0:4468:d6bf::/48 -> parses, /48, in fc00::/7.
  • bash scripts/repo-lint.sh -> 0 fail.

Revert

  • git checkout docs/dc-dc-netem-and-ula-gua-proposal.md to the pre-DOCFIX-183 revision; git rm this changelog.