Troubleshoot an ONU from Evidence, Not One Signal Number
A field workflow for separating optical loss, registration, Ethernet, power and service-policy faults before dispatching a technician.
ISP Operator Library
Field notes for people who run networks
Original, practical writing about subscriber operations, access networks, billing systems and the decisions behind a reliable ISP.
New and updated notesEvidence, configurations and operating decisions
Design PPPoE Around Failure Domains
A RouterOS PPPoE design guide focused on MTU, discovery boundaries, AAA dependency and safe rollout rather than a paste-and-hope configuration.
Build RADIUS Accounting You Can Reconcile
How to turn Start, Interim and Stop packets into reliable session evidence without mistaking counters for a financial ledger.
Migrate an ISP Billing Platform Without Losing the Audit Trail
A cutover runbook for moving subscribers, balances, packages and network policy with measurable reconciliation and a real rollback point.
Design an ISP Billing System Around Boundaries, Not Features
A framework for separating money, service entitlement and network enforcement so billing automation stays auditable as an ISP grows.
Treat TR-069 Provisioning as a State Machine
A practical model for making ACS-driven CPE provisioning observable, repeatable and safe across mixed firmware and device fleets.
RADIUS Is Your ISP Control Plane, Not Just a Password Checker
A packet-level guide to designing RADIUS authentication, policy and accounting so subscriber access remains explainable when the network is under pressure.