Category Archives: DNS

Free DNS services

Intro I stumbled upon freenom.com, which offers free DNS domain names. So I tested it and successfully registered drjohnstechtalk.ml. .ml is Mali’s top level domain. I’ve heard it’s the only African country to open up its domains for free registration. … Continue reading

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Roll your own dynamic DNS update service

Intro I know my old Cisco router only has built-in support for two dynamic DNS services, dyndns.org and TZO.com. Nowadays you have to pay for those, if even they work (the web site domain names seem to have changed, but … Continue reading

Posted in CentOS, DNS, Linux, Network Technologies, Raspberry Pi, Security, Web Site Technologies | Tagged , , , | Leave a comment

Roll your own domain drop catching service using GoDaddy

Intro I’m after a particular domain and have been for years. But as a matter of pride I don’t want to overpay for it, so I don’t want to go through an auction. There are services that can help grab … Continue reading

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Announcing a simple DNS web interface and code

Intro For demonstration purposes I’ve written a WEB interface to do DNS queries. This can be used for light querying. Once it gets abused I will pull it from the web site. Motivation Some large enterprises are behind not only … Continue reading

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Example of case-sensitive DNS usage

Intro From RFC 1035, written in November, 1987: … Note that while upper and lower case letters are allowed in domain names, no significance is attached to the case. That is, two names with the same spelling but different case … Continue reading

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The IT Detective Agency: internal DNS queries getting clobbered after bind upgrade

Intro We’ve upgraded BIND innumerable times over the years. There’s never really been an issue. The new version just picks up and behaves exactly like the old version and all is good. But this time, in upgrading from ISC’s BIND … Continue reading

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What if someone approaches you offering a domain?

Intro As a domain owner you will sooner or later get an unsolicited email like the following one I received March 28th: Hello,   We are promoting the sale of the domain name johnstechtalk.com that is being returned back to … Continue reading

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The IT Detective Agency: since when can a powered off PC do dynamic DNS updates?

Intro The IT Detectives are back after a short lull during which no great mysteries needed expert resolution – you knew that situation couldn’t last too long. The following tale was relayed to me, I unfortunately cannot claim to have … Continue reading

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Strange problem with email to paladinny.com

Intro This is probably the most obscure of all postings I will ever do – it’s really just opening up my private journal to the Internet, which helps me when I need to recall how I fixed something. So the … Continue reading

Posted in Admin, DNS, Internet Mail, SLES | Tagged | 1 Comment

The IT Detective Agency: can’t get email from one sender

Intro For this article to make any sense whatsoever you have to understand that I enforce SPF in my mail system, which I described in SPF – not all it’s cracked up to be. The details Well, some domain admins … Continue reading

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