Jio VoWiFi issue – It’s always DNS!

tl;dr If Jio VoWiFi isn’t working for you, set a different DNS resolver on the phone. While I am a big proponent of running your own resolver in the network, ( ) , you could test by using open resolvers. The issue doesn’t seem to be impacting everyone and only a subset of users. […]

DNS RPZ (Response Policy Zones) – Using DNS as a layer of defence – Part I

Update (06/08/2020) – APNIC has published this post on their blog. Robbie Mitchell from APNIC was of great help in correcting a few things and polishing the article. You can read the Part 1 on the APNIC blog here DNS(Domain Name System) is the crucial & ubiquitous fabric of the Internet.  While on the surface, […]

Chromium based browsers & DNS

While this is not something new, it perhaps has more significance because of the ever increasing market share of more than 60% of Chromium based browsers. Chromium based browsers have a very uncanny method to check if the web browser is sitting behind a captive portal. And if you’re running a recursive resolver in your […]

33,384 open DNS resolvers in India

The Shadowserver Foundation releases and updates a scan report containing results for open resolvers on the Internet. Open resolvers basically respond to any a DNS queries from anyone on the Internet. Open resolvers are bad for the Internet primarily because they are a catalyst in a DNS amplification attack. A Domain Name Server (DNS) Amplification […]