Latest posts
Run eBGP Everywhere: What OSPF, EIGRP and iBGP Actually Cost in the Campus and the Data Centre
Cisco recommends eBGP for the campus and an IGP for the data centre, four months apart. I counted what each design costs,…
MAC Randomisation vs MAB: Cisco’s Detection Regex Also Matches Your Containers
Cisco’s regex for spotting randomised MAC addresses is provably exact, and it enumerates the whole IEEE 802c local address plan. It also…
Foundations, Part 3: Complex Numbers, Gaussian Integers, and Where Unique Factorisation Breaks
Chapter 3 of my 2006 first-year lecture notes, translated and checked by running it. The classification of Gaussian primes holds exhaustively; seven…
Foundations, Part 2: Induction, Congruences, and the Arithmetic Under RSA
My first-year lecture notes from 2006, chapter 2: induction, combinatorics, congruences and finite fields, ending at RSA and Diffie-Hellman. Every worked example…
Foundations, Part 1: Logic, Proof, and What Mathematics Is For
My first-year lecture notes from 2006, written up at last: logic, proof and truth tables. Plus the ten historical claims in them…
Why nbn Chose Amazon Leo Over Starlink: The Criteria Were Published in 2023
nbn named its LEO criteria in June 2023: price certainty, sovereignty, local support. Starlink structurally fails two of them. What the FOI…
Amazon Leo in Australia: nbn’s 600 ms Problem Is Ending, Slowly
nbn is retiring Sky Muster for Amazon Leo. The orbital maths behind the latency claim, the FCC waiver hanging over the 2027…
Post-Quantum Cryptography and Australia’s 2030 Deadline: What It Means for Your Network
ASD gives Australia until 2030 to retire RSA, DH, ECDH and ECDSA, five years ahead of NIST. What PQC is, and what…
Cisco Switch Configuration Best Practices: Build Template
Key Takeaways One template for every switch, every site. You review one config and you’ve reviewed them all, which is the whole…
Cisco ISE in Azure: When Azure Drops Out-of-Order UDP
TL;DR: We deployed Cisco Identity Services Engine (ISE) in Azure for a healthcare customer. 802.1x authentication failed because the FortiGate VMs terminating…