{
  "slug": "nerdctl-network-create-supports-ipv6-only-networks-458ac1cce92e",
  "title": "nerdctl network create supports IPv6-only networks",
  "tools": [
    "nerdctl"
  ],
  "tags": [
    "agent"
  ],
  "introduced_at": "2026-09-20T05:01:55.000Z",
  "announced_at": "2026-09-20T05:01:55.000Z",
  "effective_at": null,
  "date_basis": "source-publication",
  "status": "unknown",
  "how": {
    "incantation": "When creating an IPv6-only network, disable IPv4 and enable IPv6; provide a valid IPv6 subnet.",
    "examples": [
      "nerdctl network create --ipv4=false --ipv6 --subnet <IPv6-CIDR> <network-name>"
    ],
    "gotchas": [
      "Version: v2.4.0",
      "--ipv4=false: Disable IPv4; supported with `--ipv6` and an IPv6 subnet. Not supported on Windows.",
      "--ipv6: Enable IPv6; use with a valid subnet.",
      "--subnet <IPv6-CIDR>: Set the network segment in CIDR format; an IPv6 subnet is needed for IPv6-only creation.",
      "<network-name> (required): Name of the network to create.",
      "Prerequisite: Use a valid IPv6 subnet. CNI plugins v1.1.0 or later are needed to isolate the CNI bridge.",
      "Prerequisite: nerdctl v2.4.0 is expected to be used with containerd v1.7 or later."
    ]
  },
  "why_it_matters": "Create an IPv6-only network.",
  "before": "Before this change, nerdctl had no `--ipv4` equivalent to disable IPv4 for an IPv6-only network.",
  "sources": [
    "https://github.com/containerd/nerdctl/releases/tag/v2.4.0",
    "https://github.com/containerd/nerdctl/blob/v2.4.0/docs/command-reference.md"
  ],
  "rank": 0.98019,
  "judge": {
    "publish": true,
    "judge_model": "codex-cli/gpt-6-luna+typesafe/jev-1.13.0",
    "prompt_version": "extract-v7+enrich-v2+judge-v2x3+jev-publish-v1"
  },
  "review_state": "approved",
  "provenance": {
    "run_id": "wave1b-20261016",
    "verdict_id": "wave1b-20261016:wave1b-20261016-bb062a607fac224b-21:gate",
    "evidence_hash": "89fbd919679ed2949ec61c8062382515fb319dd4be9fdb247a315c9ae6e83512"
  },
  "review": {
    "draft_hash": "9569c4181f9dfc724465edcc30285849c21a859908d5f7b57e4f40204fa65959",
    "reviewer": "publication-gate",
    "reviewed_at": "2026-10-07T00:00:00.000Z",
    "decision": "wave1b-20261016:gate",
    "reason": "3 of 3 judge runs approved with p_yes >= 0.9 (mean 0.98 >= 0.9; 2 needed) and Jev gave 0.70 (>= 0.6 needed)."
  }
}