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  RADIUS Change of Authorization (CoA) enables network operators to modify an active subscriber session without requiring the user to disconnect and reconnect. This guide explains how RADIUS CoA works, including the CoA request and response process, UDP port 3799, session identification, and the role of RFC 5176. The article also covers practical use cases such as mid-session bandwidth upgrades, quota enforcement, captive portal redirects, policy changes, and session management. It explains the difference between CoA and Disconnect-Request, common CoA failure scenarios, Error-Cause responses, and compatibility considerations across different NAS vendors and firmware versions. The guide is useful for telecom operators, ISPs, network engineers, AAA administrators, and professionals working with RADIUS-based network access and subscriber policy management. Read the full RADIUS CoA guide on Alepo

Every AAA vendor publishes a transactions-per-second (TPS) figure, but few say what traffic produced it. A PAP request answered from cache and an EAP-SIM authentication waiting on an HSS lookup both count as one authentication. The second costs the server far more work. That gap is why a vendor’s TPS rarely matches what your network sees in production. Our new guide to AAA server stress testing sets out a method for validating any authentication, authorization and accounting platform, ours included, against the traffic it will actually carry. It starts with a traffic profile built from at least two weeks of your own NAS and AAA logs. The profile includes authentication method mix, accounting ratio and interim interval, CoA and Disconnect volume, backend latency from LDAP, HSS or SQL, and the number of NAS clients sending traffic. If you get these wrong, the test measures a network you don’t have. From there, the guide covers nine scenarios a carrier-grade AAA platform should pass: Th...

 When an AAA (Authentication, Authorization, and Accounting) server goes down, the impact goes far beyond failed network connections. Telecom operators can lose revenue, face SLA penalties, experience billing inaccuracies, and risk losing customers. As an outage continues, new connections may fail while existing subscribers gradually lose access as their sessions expire or require re-authentication. At the same time, customer support requests increase, and missing accounting records can result in unbilled usage. According to the blog, The Real Cost of One Hour of Authentication Downtime , the financial impact can include lost revenue, SLA credits, billing discrepancies, incident response costs, customer churn, and reputational damage. Its illustrative example estimates that a one-hour outage at a telecom operator with two million subscribers could cost approximately $323,000 , depending on the assumptions used. Actual costs will vary by operator and network conditions. Common cause...

  Most operators launched 5G the fast way. Non-Standalone put 5G radio under the existing 4G core, kept the HSS , kept the PCRF , and got a 5G badge on the phone in months. The trade was deferred rather than avoided. Under Standalone, the 5G core takes over the control plane entirely, and everything the EPC was quietly doing for authentication, policy, and subscriber data now has to be done by new functions over new interfaces. The systems that were fine under NSA are the ones nobody re-evaluated. Our new article is not another explainer of what 5G SA is. It is a working gap analysis built around four dimensions: authentication protocol support, policy control granularity, network slicing readiness, and subscriber data architecture. For each one you get the NSA -era state, the SA requirement, and the indicator that tells you whether you have a gap, all in a single table you can score in an afternoon. It also covers the traps that surface during SA integration testing rather th...

  This cost of standing still has been priced. In principle, the budget committee has agreed. The legacy AAA platform replacement is on the roadmap. It then reaches the security architecture review, which raises questions unrelated to cost. What's today's exposure? Which controls are changed? What risk remains afterwards, and who is responsible? This is a different document. Not the finance case with the word "risk" pasted on top. A CISO evaluates residual risk ; cases not written with this in mind often stall. The new guide explains how to build one. It is organised around three key areas a security team evaluates: attack surface, compliance and audit exposure, and detection and containment speed. For each area, compare the legacy platform's impact, the modern platform's effect, and the specific control that drives change. There's a worked scoring row in there, using a credential-stuffing run against the broadband realm, so you can see what a scored sc...

  Most of the reliability conversation around AAA runs one way: how do you verify a vendor's availability claims before you buy? Our latest blog turns that around. Once your AAA platform is reliable, how do you prove it to a regulator who can fine you and to an enterprise customer deciding whether to renew? Sandeep Kalekar breaks the problem down by audience. Regulators rarely name AAA directly, but most jurisdictions require operators to report outages and security incidents above defined impact thresholds, and an AAA failure that stops subscribers from authenticating will usually cross them. What regulators want is compliance-format reporting: incident notifications within set windows, post-incident reports covering root cause, subscriber impact, and remediation, and evidence that redundancy and failover were in place and tested before the failure. The post points to the FCC outage-reporting regime and the EU's NIS2 directive as comparable frameworks. Enterprise, wholes...