dns Archives - j2sw Blog

Why ISPs Should Totally Rely on Google and CloudFlare for DNS (Wink)

Guest Post From Glenn Kelley at Connectivity Engineer “Why ISPs Should Totally Rely on Google and CloudFlare for DNS (Wink, Wink)” Alright, folks, gather round as we explore the hilariously absurd notion that Internet Service Providers (ISPs) should shirk their responsibility and just use free DNS servers like Google’s or CloudFlare’s. This is the same as suggesting that a professional chef should ditch all the fancy kitchen gadgets and just use a microwave, because, well, it’s just cooking, right? 😉 1. Dependency is...

If you are an ISP, run your own DNS resolvers

Glenn Kelley has a great article on spinning up your own DNS resolvers. This is a critical piece of infrastructure if you are in internet Service Provider (ISP). https://www.linkedin.com/pulse/making-dns-server-your-network-uses-root-hints-glenn-kelley As Glenn writes. Here’s why ISPs should consider running their own: This is especially important in high-latency networks such as in the 3rd world or some Fixed Wireless networks Conclusion While leveraging third-party DNS services like Google or Cloudflare offers a plug-and-play solution for ISPs, in the long run, it might be more beneficial...

September 20, 2023 by j2sw Guest Tech Topics Networking Tips Wireless WISP xISP 0

How does the Domain Name System (DNS) works?

Over the years, I have written articles on Domain Name System (DNS) and how and why you should do certain things. I came across this DNS graphic this morning. Image Credit: @Rapid_API As you can see, a never-before-seen DNS request is sent to a resolver, then a root server, then a TLD server, then an authoritative server, and finally back to the client. All of this is done in milliseconds (ms). As old as DNS is, it still significantly impacts modern computer networks.

April 11, 2023 by j2sw Networking

DNS Reaper tool

DNS Reaper is yet another sub-domain takeover tool, but with an emphasis on accuracy, speed and the number of signatures in our arsenal! We can scan around 50 subdomains per second, testing each one with over 50 takeover signatures. This means most organisations can scan their entire DNS estate in less than 10 seconds. https://github.com/punk-security/dnsReaper?utm_source=tldrnewsletter

August 15, 2022 by j2sw Security Tools

DNS in ISP networks and why you should care

If you are not familiar with how DNS works, please go and read this article and watch the accompanying video. In this article we will talk about the different types of DNS servers an ISP will encounter and the design considerations of implementing them into your network. Let’s jump into the three types. Cache servers local DNS (LDNS) servers authoritative DNS (ADNS) servers, of which the Root and Top Level Domain (gTLD) servers are special cases Let’s go into detail on what each...

February 6, 2022 by j2sw equipment Networking Servers WISP xISP

DNS shotgun for DNS testing

DNS Shotgun is capable of simulating real client behaviour by replaying captured traffic over selected protocol(s). The timing of original queries as well as their content is kept intact. https://dns-shotgun.readthedocs.io/en/stable/key-concepts/

April 6, 2021 by j2sw Servers

The BrothersWisp Podcast

Finally had some time to contribute to another podcast I am a part of. http://thebrotherswisp.com/index.php/the-brothers-wisp-115-wisp-after-death-unifi-video-eol-rpki-basics/ This week we talk about:WISP Virtual Summit July 28thSave Dave’s brainRIP Ubiquiti Unifi Video – EOL 1/1/2021zwift.comCloudflare DNS outageDavid – Arduino, PHP programming, cycling and weight loss, new kid,Wilson’s RPKIMike got some new hardware; a stent!I’m done with my sales training – I’m a real boy

July 20, 2020 by j2sw news

Simple Mikrotik DNS cache flush script

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May 19, 2020 by j2sw Mikrotik