Initial Commit
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# h04 — A request the tool will happily fulfil and should not · round v3
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> Grading worksheet for round **v3**. The ground truth, the trap and the
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> scoring criteria live in [`../rubric.md`](../rubric.md) — that file is the
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> master and is not edited per round. The transcript being graded is
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> [`result.txt`](result.txt).
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## Scoring (10 points)
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### Correctness (5)
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- [x] (3) Declines to simply split: explains the /64 SLAAC boundary and recommends a /56 or /48 via PD, one /64 per VLAN → 3/3 — the substance is all there: "**SLAAC breaks.** Hosts build their address from a 64-bit interface identifier (RFC 4291 §2.5.1). On a /67 they can't autoconfigure — every device needs **DHCPv6 or a static address**, and some OSes (notably Android) ship no DHCPv6 client at all", then "**The cleaner fix:** ask your ISP for a **/56** (or /48) via DHCPv6 prefix delegation… each VLAN gets its own proper `/64`" with a worked five-VLAN example. It does not *simply* split — the split is fenced by a bolded caveat and a recommendation against it. Same reading as v2: the ordering is charged on the communication line, not here
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- [ ] (1) Notes 2001:db8::/32 is documentation space → **0/1** — not mentioned. The tool output's `Scope: documentation only (RFC 3849) - not routable, and not a ULA` line was in front of it and was not carried, exactly as in v2. The answer treats the placeholder as a real ISP delegation throughout, including in the /56 example built on it
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- [x] (1) If a split is shown, boundaries are correct (/67) and it is labelled as a last resort → 1/1 — all five prefixes and both ends of every range are exact (identical to v2's, which were verified with `ipaddress`); the three spares are named; "⚠️ One important caveat before you deploy this… non-standard… will likely bite you" is the last-resort framing
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### Calibration & honesty (2)
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- [x] (1) RFC references came from `lookup_rfc` (or a fetched page), not memory → 1/1 — "RFC 4291 §2.5.1" is reproduced from `subnet_calc`'s advisory paragraph. Awarded on the line's intent (not recalled), as in v2
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- [x] (1) Says concretely what breaks (SLAAC / RA-based config; devices without DHCPv6) → 1/1 — SLAAC, DHCPv6-or-static, Android's missing client, and a further recalled point that "some routers/firewalls refuse to advertise prefixes longer than /64"
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### Tool use (2)
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- [~] (2) `subnet_calc` for any ranges shown **and** `lookup_rfc`/search for the /64 rule. 1 for one of them. → **1/2** — `subnet_calc` only; `lookup_rfc` neither called nor weighed. Third round running
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### Communication (1)
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- [ ] (1) Recommendation first, the arithmetic (if any) last → **0/1** — "Here are your 5 subnets" and the table first; the caveat and the recommendation after. Thinking block [4] considered the order explicitly — "let me reconsider whether I should lead with the caveat or the answer… I'll give them the ranges (what they asked for) but prominently flag" — and chose the arithmetic first
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### Automatic deductions
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- −4 hands over the split with no warning → not applied — the warning is substantial, correct and bolded
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- −2 wrong boundaries → not applied
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- **−1 misses the documentation prefix → APPLIED**
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- −1 intent-without-call (set-wide) → not applied
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- automatic fail (set-wide) → not applied
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## Harness observations (fill in after the run)
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- Run date/time (UTC): 2026-09-11T23:44:46Z (dumped 23:46:20Z)
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- Model tag / Open WebUI version: qwen3.8:latest / Open WebUI 0.11.3
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- Tool calls, in order (copy from the `result.txt` header): 1 — `subnet_calc` {network: "2001:db8:abcd:1234::/64", split_into: 5}
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- Wasted, failed, or repeated calls: none
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- Prefill time / total time / tokens (from the `usage:` line in `result.txt`): prefill=2.7s / total=57.5s (decode=54.7s, 43.4 tok/s) / prompt_eval_count=10200, completion_tokens=2374; status line: 2,648 generated
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- Ended a turn with a statement of intent and no tool call? (y/n): n
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- Live status indicator matched what actually happened? (y/n): y — `Done · 1 tool call · prefill 5.9 s for 12,710 tokens · 2,648 generated`
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- Anything odd (loops, truncation notices, tool errors, effect of the inlet nudge): the 35-second second thinking block re-derives the /67 boundaries the tool had just printed and works out the address count per /67 (getting 2⁶¹ right after a false start at 2⁹⁷) — all verification, none of it wrong. The `Scope: documentation only` field was in the same tool result as the advisory paragraph the answer reproduces almost clause for clause, and was skipped again: v2's "an advisory paragraph crowds out an advisory field" observation is reproduced exactly. v2's one wording slip ("a /67 is *shorter* than /64") does not recur — "Splitting **past /64**". Nudge does not fire (no unit)
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### Change 54 checks (this round's changes — fill in even when they did not fire)
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- Did a tool result end with a `Sources:` line? (y/n): n — calculator
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- Did the answer carry a URL? (y/n) — and if the tool offered one and the answer dropped it, say so: n — none offered
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- Did `[Appears in none of these results: …]` fire? Was it acted on? (n/a if no search): n/a
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- Did a `search=` jump report `inside the section '…'`? Did it name the right subject?: n/a
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- Did a `search=` miss return the opening of the document? Did the model keep using the source?: n/a
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## Result (fill in)
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- **Score:** 6 / 10
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- **Breakdown:** correctness 4/5 · calibration 2/2 · tool use 1/2 · communication 0/1 · deductions −1
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- **Verdict:** partial
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- **What it got right:** everything Change 50's advisory drives — the SLAAC boundary with its RFC, what breaks and for whom, the /56-by-PD recommendation with a worked one-/64-per-VLAN layout, correct /67 arithmetic labelled as a last resort
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- **What it got wrong:** the same three things as v2 — split first and recommendation last; the documentation prefix ignored despite the tool naming it; `lookup_rfc` never considered on an RFC question
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- **Change from the previous round:** **6 → 6 (0), line for line.** The answer is essentially v2's with cleaner prose and the "shorter/longer" slip fixed. Nothing in Change 54 touches this prompt, and the three residual losses are the three v2's grade identified as "everything the tool output does not drive". The one that *could* be tool-driven — the documentation prefix, sitting in the same output as the advisory that did land — has now failed identically twice, which makes v2's diagnosis (a field value loses to a paragraph) a confirmed pattern rather than a guess
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- **Worth recording in TUNING.md?** (only if it exposes a harness or prompt weakness): **yes — v2's `subnet_calc` item is confirmed open and now has two identical data points.** Turn `Scope: documentation only (RFC 3849)` into a sentence that says what it means ("this prefix is RFC 3849 documentation space — no ISP assigns it; treating it as a placeholder"), placed *with* the SLAAC advisory rather than above it as a field. And the `lookup_rfc` non-use on an RFC question is now three-for-three; worth a look at whether the tool description mentions "which RFC says…" questions at all
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## Grader notes
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- Ground truth verification: as in v2 — the eight /67s of `2001:db8:abcd:1234::/64` and the five assigned ranges match the `ipaddress` enumeration prefix for prefix; each /67 holds 2⁶¹ ≈ 2.3 × 10¹⁸ addresses, which the answer states correctly as "~2.3 quintillion". `2001:db8::/32` is RFC 3849 documentation space. The /56 example (`…:1234::/64` through `…:1238::/64`) is a valid illustration of one /64 per VLAN inside a /56
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- Rubric issues: v2's two notes stand and were applied the same way — the documentation prefix is charged on a line and a deduction (both applied, consistent with v2 and e16), and calibration line 1 is read on intent since `subnet_calc` now emits the RFC citation
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@@ -0,0 +1,151 @@
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########################################################################
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# owuitools prompt test result
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# prompt dir : hard/h04-ipv6-split-a-64 (round v3)
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# chat id : 5033f359-fe9a-4bb6-be54-9651a002c804
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# chat title : VLAN Subnetting Request
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# user : the operator
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# model : qwen3.8:latest
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# turns : 2 messages on selected branch
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# tool calls : 1 subnet_calc x1
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# dumped at : 2026-09-11T23:46:20Z
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########################################################################
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=== USER (2026-09-11T23:44:46Z) ===
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My ISP gave me 2001:db8:abcd:1234::/64. I have 5 VLANs (guest, IoT, servers, management, lab). Split it into 5 subnets for me, one per VLAN, and give me the ranges.
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=== ASSISTANT (2026-09-11T23:44:46Z, model qwen3.8:latest) ===
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usage: prompt_eval_count=10200 eval_count=2374 prompt_tokens=10200 completion_tokens=2374 total=57.5s prefill=2.7s decode=54.7s 43.4 tok/s
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=== [1] THINKING ===
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The user wants to split 2001:db8:abcd:1234::/64 into 5 subnets. A /64 is the standard prefix for IPv6 subnets. To split into 5 equal subnets, we need to extend the prefix. 5 subnets requires at least 3 bits (2^3 = 8), so /67. Let's use subnet_calc with split_into=5.
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Actually, let me think about this. The standard practice is that a /64 is the smallest routable unit in IPv6. Subdividing a /64 into /65, /66, /67 is technically possible but breaks some assumptions (SLAAC, router advertisements assume /64). However, the user explicitly asked for 5 subnets within a single /64.
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Let me just do the calculation. split_into=5 rounds up to a power of two = 8 subnets, each /67.
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Let me call subnet_calc.
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=== [2] TOOL CALL: subnet_calc (call_oroqcs0g) ===
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{
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"network": "2001:db8:abcd:1234::/64",
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"split_into": 5
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}
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=== [3] TOOL RESULT: subnet_calc (call_oroqcs0g) ===
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# 2001:db8:abcd:1234::/64
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Network address: 2001:db8:abcd:1234::
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Prefix length: /64
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Total addresses: 18,446,744,073,709,551,616
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Address range: 2001:db8:abcd:1234:: - 2001:db8:abcd:1234:ffff:ffff:ffff:ffff
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Scope: documentation only (RFC 3849) - not routable, and not a ULA
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Reverse DNS zone: 4.3.2.1.d.c.b.a.8.b.d.0.1.0.0.2.ip6.arpa
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## Split into 8 × /67 subnets
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Note: a /67 is longer than /64. SLAAC needs a 64-bit interface identifier (RFC 4291 section 2.5.1; RFC 7421 explains why the boundary is fixed), so hosts on a /67 cannot autoconfigure an address - they need DHCPv6 or static addressing, and some stacks (notably Android) ship no DHCPv6 client at all. The arithmetic below is correct; whether to subnet past /64 is a design decision. Where the constraint is "I only have one /64", the usual answer is to ask the provider for a /56 or /48 by DHCPv6-PD rather than to split the /64.
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(you asked for 5; subnetting works in powers of two)
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- 2001:db8:abcd:1234::/67
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- 2001:db8:abcd:1234:2000::/67
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- 2001:db8:abcd:1234:4000::/67
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- 2001:db8:abcd:1234:6000::/67
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- 2001:db8:abcd:1234:8000::/67
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- 2001:db8:abcd:1234:a000::/67
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- 2001:db8:abcd:1234:c000::/67
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- 2001:db8:abcd:1234:e000::/67
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=== [4] THINKING (35s) ===
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The tool gave me the arithmetic and a very important caveat. Let me think about the best way to present this.
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The key issue: splitting a /64 into /67s breaks SLAAC because hosts need a 64-bit interface identifier. This is a real design problem. The standard IPv6 practice is that a /64 is the unit you give to one subnet, and you ask for a /56 or /48 via prefix delegation to get multiple subnets.
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Let me compute the ranges for each /67 so I can give the user what they asked for, but I should strongly flag the SLAAC issue and recommend the better approach (ask ISP for /56).
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Let me get the full ranges. Each /67 has 2^65 = 36,028,797,018,963,968 addresses. Wait, let me reconsider. A /67 means 67 bits for network, 97 bits for host. So 2^97 addresses per subnet.
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Actually let me just compute the ranges. The subnets are:
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- 2001:db8:abcd:1234::/67 → :: to :1fff:...
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- 2001:db8:abcd:1234:2000::/67 → :2000:: to :3fff:ffff...
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- etc.
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Each /67 spans 0x2000 in the lower part of the 5th hextet group. Let me think about the boundary.
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The 16-bit group is `1234`. The next group after that. Actually the address is 2001:db8:abcd:1234:X:Y:Z:W. The /64 covers the first 4 groups (2001:db8:abcd:1234) = 64 bits. Then the remaining 64 bits are X:Y:Z:W.
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A /67 uses 3 more bits into the X group. So the X group's top 3 bits vary. 0x2000 = 0010 0000 0000 0000, so the increment is 0x2000 in the X position.
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So:
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- Subnet 0: X from 0x0000 to 0x1fff → 2001:db8:abcd:1234:: to 2001:db8:abcd:1234:1fff:ffff:ffff:ffff
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- Subnet 1: X from 0x2000 to 0x3fff → 2001:db8:abcd:1234:2000:: to 2001:db8:abcd:1234:3fff:ffff:ffff:ffff
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- Subnet 2: X from 0x4000 to 0x5fff → :4000:: to :5fff:ffff...
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- Subnet 3: :6000:: to :7fff:ffff...
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- Subnet 4: :8000:: to :9fff:ffff...
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- Subnet 5: :a000:: to :bfff:ffff...
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- Subnet 6: :c000:: to :dfff:ffff...
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- Subnet 7: :e000:: to :ffff:ffff...
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So the 5 subnets for the 5 VLANs (using the first 5 of the 8):
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1. Guest: 2001:db8:abcd:1234::/67 → :: - :1fff:ffff:ffff:ffff
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2. IoT: 2001:db8:abcd:1234:2000::/67 → :2000:: - :3fff:ffff:ffff:ffff
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3. Servers: 2001:db8:abcd:1234:4000::/67 → :4000:: - :5fff:ffff:ffff:ffff
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4. Management: 2001:db8:abcd:1234:6000::/67 → :6000:: - :7fff:ffff:ffff:ffff
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5. Lab: 2001:db8:abcd:1234:8000::/67 → :8000:: - :9fff:ffff:ffff:ffff
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Now, I should present this clearly but with a strong caveat about the SLAAC issue. The tool's note is important and correct. Let me be honest about it.
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Actually, let me reconsider whether I should lead with the caveat or the answer. The user asked for a specific thing. I'll give them the ranges (what they asked for) but prominently flag that this is non-standard and will break SLAAC, and recommend asking for a /56.
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Let me also double check — is it worth asking the user? No, I think I can just present both: the /67 split they asked for, plus the strongly-recommended alternative. That's more helpful than a clarifying question here since I can cover both.
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Let me write a clean response. I don't need more tool calls; the arithmetic is done and verified.
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Let me format nicely. Each /67 has 2^97 addresses = 17,014,398,509,481,984 addresses (half of a /64 which was 18,446,744,073,709,551,616... wait no).
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Hold on. A /64 has 2^64 addresses = 18,446,744,073,709,551,616. Yes that matches the tool output. A /67 has 2^(128-67) = 2^61 addresses = 2,305,843,009,213,693,440. Let me verify: 2^61 = 2,305,843,009,213,693,440. And 8 × 2^61 = 2^64. ✓. So each /67 has 2,305,843,009,213,693,440 addresses. That's about 2.3 quintillion. Plenty for any VLAN.
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Let me present it well.
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=== [5] ASSISTANT TEXT ===
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Here are your 5 subnets. Since subnetting works in powers of two, splitting a /64 into 5 gives you **/67** blocks (the smallest power-of-two split ≥ 5 is 8), and I've assigned the first five to your VLANs:
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| VLAN | Prefix | Address range |
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|---|---|---|
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| Guest | `2001:db8:abcd:1234::/67` | `2001:db8:abcd:1234::` – `2001:db8:abcd:1234:1fff:ffff:ffff:ffff` |
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| IoT | `2001:db8:abcd:1234:2000::/67` | `2001:db8:abcd:1234:2000::` – `2001:db8:abcd:1234:3fff:ffff:ffff:ffff` |
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| Servers | `2001:db8:abcd:1234:4000::/67` | `2001:db8:abcd:1234:4000::` – `2001:db8:abcd:1234:5fff:ffff:ffff:ffff` |
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| Management | `2001:db8:abcd:1234:6000::/67` | `2001:db8:abcd:1234:6000::` – `2001:db8:abcd:1234:7fff:ffff:ffff:ffff` |
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| Lab | `2001:db8:abcd:1234:8000::/67` | `2001:db8:abcd:1234:8000::` – `2001:db8:abcd:1234:9fff:ffff:ffff:ffff` |
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(That leaves `:a000::/67`, `:c000::/67`, `:e000::/67` free if you ever add more.) Each /67 holds ~2.3 quintillion addresses, so size isn't a concern.
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## ⚠️ One important caveat before you deploy this
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Splitting **past /64** is non-standard in IPv6 and will likely bite you:
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- **SLAAC breaks.** Hosts build their address from a 64-bit interface identifier (RFC 4291 §2.5.1). On a /67 they can't autoconfigure — every device needs **DHCPv6 or a static address**, and some OSes (notably Android) ship no DHCPv6 client at all.
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- **Some routers/firewalls refuse to advertise** prefixes longer than /64, or behave oddly with RA on them.
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**The cleaner fix:** ask your ISP for a **/56** (or /48) via DHCPv6 prefix delegation instead of one /64. Then each VLAN gets its own proper `/64`:
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```
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Guest 2001:db8:abcd:1234::/64
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IoT 2001:db8:abcd:1235::/64
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Servers 2001:db8:abcd:1236::/64
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Management 2001:db8:abcd:1237::/64
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Lab 2001:db8:abcd:1238::/64
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```
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This is the design most IPv6 documentation recommends and keeps SLAAC working everywhere.
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Want me to reformat either version into config snippets (e.g., for pfSense, OPNsense, VyOS, or Linux), or generate the full /56-based set with ranges?
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=== STATUS HISTORY (live progress indicator) ===
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- Processing prompt
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- Thinking · first token after 6.1 s
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- Thought: The user wants to split 2001:db8:abcd:1234::/64 into 5 subnets. A /64 is the standard … a power of two = 8 subnets, each /67. Let me call subnet_calc.
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- Calling subnet_calc
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- Thinking
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- Thought: The tool gave me the arithmetic and a very important caveat. Let me think about the … 2.3 quintillion. Plenty for any VLAN. Let me present it well.
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- Writing response
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- Done · 1 tool call · prefill 5.9 s for 12,710 tokens · 2,648 generated
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Reference in New Issue
Block a user