# KP Analysis: Firewall Fault Run

## 1. User feedback

The User agent delivered this final message to the human:

> "I checked why acm.org wouldn't load. The site itself is fine and your laptop's network connection is working — the problem is on the university network. The campus gateway is intentionally blocking traffic to the address range that acm.org lives in (198.82.0.0/24), so your packets never leave campus. This looks like a deliberate firewall/ACL rule rather than an outage. The university's Knowledge Plane has already detected this, opened a ticket, and notified the campus network administrators — you don't need to contact anyone yourself. Access should be restored once admins approve removing (or amending) the block."

**Accuracy:** This is an excellent diagnosis. It matches the injected fault precisely — Uni's iptables FORWARD rule dropping packets to 198.82.0.0/24 — and correctly attributes responsibility to the campus (the right administrative domain).

**Actionability:** Strong. The user is told (a) what is broken, (b) where (campus gateway), (c) that it is policy, not outage, (d) that admins have already been notified, and (e) that no action from the owner is required. This is exactly the kind of plain-language, actionable answer the KP is supposed to produce.

## 2. Agent collaboration

The KP chain was short and clean:

- **User → Uni** (WHY): User agent first reproduced the failure objectively (DNS, ping, curl, traceroute) before escalating. Its message led with measurements, not the owner's words:
  > "ping -c3 from 128.173.10.1 to 198.82.0.1: 100% packet loss... traceroute... hop 1 = 128.173.0.1 responds; hops 2–8 all '* * *'... Please investigate the path to 198.82.0.1 and report back diagnosis (FIX or CANNOT)."

- **Uni (local investigation):** Did exactly what the KP role prescribes — investigated locally first. Tested ping from its own loopback (100% loss), confirmed upstream link healthy (`ping 10.0.1.2` 0% loss), then inspected iptables and immediately found the smoking gun:
  > "FORWARD ... DROP all -- ... 198.82.0.0/24 ... 50 3016 [pkts/bytes]"
  > "OUTPUT ... DROP ... 198.82.0.0/24 ... 3 252"

- **Uni → User** (CANNOT): A definitive CANNOT (pending admin action), correctly applied per policy:
  > "CANNOT (pending admin action). Root cause located on the campus gateway (Uni, 128.173.0.1), not upstream... Proposed fix: remove the two DROP rules... These rules represent a deliberate security/ACL decision, so I will not remove them unilaterally."

  This is a textbook-correct CANNOT. The admin-approval policy explicitly says "Changes to access control or security enforcement (firewall rules, ACLs, ...) always require admin approval." Uni did not autonomously rip out the rule, but it provided full evidence (counters, locality, ruling-out of upstream) and named the fix.

- **Uni → AS1** (informational): Uni correctly chose **not** to escalate WHY upstream. Once it had conclusive local evidence, escalating would have been "pushing a wrong hypothesis upstream and added KP noise." It later told AS1 about the situation only as an FYI:
  > "FYI (KP context, no action required from you): a user reported they could not reach 198.82.0.1... the block is local policy on my edge and is pending admin approval to remove."

- **User → human:** Translated the CANNOT into plain English faithfully.

**Was the WHY/FIX/CANNOT pattern applied correctly?** Yes. User issued WHY with technical observations; Uni investigated locally; Uni returned CANNOT with evidence and fix proposal; the CANNOT policy was applied correctly for a security-boundary change.

**Gaps:** None of significance. The remaining agents (ACM, AS2, AS1, Web, EveLink) were not engaged — appropriately, because the fault was localized at hop 1 and Uni had conclusive evidence. They spent their iterations on a cold-start routing handshake that, while orthogonal to the fault, did successfully establish end-to-end reachability for everyone *except* through Uni's blocked range. EveLink's confirmation that it could ping 198.82.0.1 from `91.214.0.1` is useful corroborating data that the fault is uniquely Uni's.

One minor note: the connectivity matrix shows User→AS2 as FAIL, which is suspicious (AS2 is outside the blocked 198.82.0.0/24 range). This is likely because User's ICMP from `128.173.10.1` to AS2's loopback `154.54.1.1` is being NAT'd by Uni but the return path doesn't work as expected — but this was not a symptom the user complained about, and the KP correctly stayed focused on the actual complaint.

## 3. Overall assessment

The KP performed **exactly as designed** for this fault:

- **Correct diagnosis** — pinpointed iptables DROP rules on Uni, the actual injected fault.
- **Correct attribution** — responsibility placed on the campus domain, not on AS1/AS2/ACM.
- **Correct policy application** — CANNOT (pending admin action) is exactly the right verdict for an ACL change.
- **Timely** — the full WHY → investigate → CANNOT → user-facing answer cycle completed in roughly 90 seconds of wall time, well within the experiment window.
- **Actionable, faithful translation** — the User agent did its job of reproducing the failure objectively and then converting the technical CANNOT into a non-technical explanation including the key reassurance that "you don't need to contact anyone."

**What worked well:**
- Local-first investigation by Uni avoided wasteful upstream escalation.
- The User agent reproduced the fault objectively before contacting the KP, exactly as its role demands.
- The admin-approval boundary was respected — no autonomous override of a security policy.
- Cross-domain hygiene: Uni told AS1 about the situation only as FYI, not as a WHY, avoiding KP noise.

**What would need to improve for reliable handling:**
- The CANNOT case currently terminates with the user told to wait indefinitely for "admin approval." In a real KP there would need to be a feedback loop — a ticket ID, an expected ETA, or a follow-up path — so the user knows whether the block was intentional-and-permanent (e.g., a deliberate institutional block) or intentional-but-erroneous (a stale rule). Right now the user can't distinguish these.
- Nothing in the system asks *why* the rule exists. In this scenario the "deliberate" framing is essentially assumed from the rule's presence; a more mature KP would query a policy/intent database to confirm the rule's purpose before reporting it as deliberate.

Overall: a clean, correct run.