Archive | January, 2011

How to clear the DNS cache in Mac OSX, Windows and Linux

If you are developing websites, then the chances are at some time or other you have been driven crazy when you have updated the DNS for a client’s website only to find that your web browser is returning an error, or serving the default Apache webpage.

So, you go and check the DNS out using something like only to find that everything appears to be correct.

The confusion can be further compounded by the fact that some tools rely on the operating system’s cache (as do web browsers), while others fetch fresh results. For example, you can ping on OSX, and get a completely different IP address to that returned by dig a

This is because sometimes, the operating system’s cache doesn’t update quickly enough, because the TTL values stored within it haven’t yet timed out – so it sees no reason to go and fetch new results – not while the cached IP is reachable.

So, that’s the why – here’s the how! Read More…

Recording cockpit video and audio

Hopefully this will help any Microlight or GA pilots out there who want to record their flights with crisp clear audio direct from the cockpit intercom system.

There are a number of solutions around, but most are quite bulky, and, frankly somewhat more expensive that the hudred and thirty odd quid that this lot came to. The main difficulty is in finding a camera system that has external microphone inputs – this alone usually precludes any of the consumer level equipment, so you are left with buying devices that cost over £200. Read More…

Use MobileMe with your own domain

So, you have a Mac, and maybe an iPhone too. You want to receive on your Apple toys, and you want to be able to send email using your own domain too – but Apple won’t let you send email from your own domain via their MobileMe service.

So – what do you do?

If you already have an email account that supports forwarding (and almost all do) then it actually pretty easy to work out. Read More…