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sync: auto-sync from GURU-5070 at 2026-06-12 17:44:04

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Author: Mike Swanson
Machine: GURU-5070
Timestamp: 2026-06-12 17:44:04
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Mike Swanson
2026-06-12 17:44:19 -07:00
parent aebf307a81
commit ac3dbbbec9
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---
name: feedback_no_inferred_topology_as_fact
description: Never present an inferred network link as an observed fact; private-IP overlap is not evidence of a shared fabric, and a failed reachability test disproves a link rather than needing to be explained away.
metadata:
type: feedback
---
On 2026-06-12, investigating VWP-ROSE (Valley Wide Plastering), I concluded Valley
Wide was "Local" to the ACG office via a site-to-site VPN. Mike: there is NO
site-to-site between VWP and the office. I had fabricated the link.
**Why it was wrong:**
- I asserted "VWP-ROSE reached the office RMM server (172.16.3.30) by its real
private IP with no NAT" — I never observed that. Field agents connect to
`rmm-api.azcomputerguru.com` (PUBLIC IP), like ~199/200 of the fleet. `172.16.3.30`
is only *my* office-side base URL; the agent never uses it.
- I read a `172.16.x` overlap (office `172.16.3.x` vs VWP `172.16.9.x`) as a shared
fabric. It is coincidence — `172.16.0.0/12` is RFC1918 space countless unrelated
LANs reuse. Overlapping private ranges prove nothing.
- My own test (force `172.16.3.30` over the corp NIC) FAILED — that disproved the
link. I rationalized it as "asymmetric routing" to preserve my conclusion.
**How to apply:**
- State only what was observed; label inferences as inferences. Never narrate an
unobserved packet/path as if it happened.
- Private-IP overlap is NOT evidence two networks are connected. Require positive
proof (a tunnel config, a successful end-to-end reach with the real source IP).
- When a test contradicts the hypothesis, update the hypothesis — do not invent a
mechanism to dismiss the failure.
- To test "can this adapter reach RMM," use the EXTERNAL endpoint
(`rmm-api.azcomputerguru.com` / its public IP), not the internal `172.16.3.30`.
Nearly every agent is external. See [[reference_gururmm]].