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, ( runyourownresolver.in ) , you could test by using open resolvers. The issue doesn’t seem to be impacting everyone and only a subset of users. […]

How to improve the root – Run it locally

Current State of DNS Root Servers The DNS root server system uses IP Anycast.There are 13 root server operators with a total of 1084 instances all over the world. Let’s look at some of the problems in the context of the root server system, Decrease the round trip time to the root servers The round […]

Jumping on the webinar bandwagon – Introduction to FreeBSD

Note – The FreeBSD Logo and the mark FreeBSD are registered trademarks of The FreeBSD Foundation and are used by Swapneel Patnekar with the permission of The FreeBSD Foundation. With COVID-19 having disrupted NOG meetings, conferences and onsite trainings, I have decided to jump on the webinar bandwagon and experiment a bit. On 8th June, I presented an introduction to FreeBSD to students and […]

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, […]

Junk to the root

DNS root servers are the heart of the DNS infrastructure. Although there are just 13 of them, the actual number comprises of 1084 instances in Anycast operated by 12 independent root server operators. A recent study by ICANN OCTO on Analysis of the Effects of COVID-19-Related Lockdowns on IMRS Traffic shed some light on DNS […]

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 […]

Educational & Research Institutions in India having their own ASN

A few months ago, Pranesh had asked if there are any universities in India that have their own ASN. I think the answer warrants a few more details. AS132785 Shiv Nadar University AS137282 KIIT University AS133552 B.M.S College Of Engineering AS38872 Indian School of Business AS137617 Indian Institute Of Management, Ahmedabad AS136304 Institute Of Physics, […]

Host a RIPE Atlas software probe in your network

RIPE Atlas is a global network of devices, called probes and anchors, that actively measure Internet connectivity. RIPE Atlas users can also perform customised measurements to gain valuable data about their own networks.  At the time of writing, there were 11,009 probes connected, the total number of probes connected is maybe higher than this as probes go offline due to Internet disconnections, […]