I was almost stumped by one question when doing a talk at Reading Uni. Having explained IPv6 and answered a lot of questions, someone asked "So IPv6 is not backward compatible with IPv4 then?"
The reason I was stumped is that you have to have a pretty clear idea what you mean by "backwards compatible" to answer that.
Now, I would say that it means that "when you upgrade to the new thing you don't lost the ability to use the old thing"... To me that makes IPv6 "backwards compatible".
But he went on to make the analogy with a "blu-ray player, which can play DVDs, so backwards compatible" and complained that an "IPv6 only machine cannot access IPv4"...
The answer is simple. A blu-ray play has two lasers (or more) in it, one plays Blu-ray and one plays DVDs. I.e. it is a "dual stack" disk player. This is the same as having a machine that is dual stack with IPv4 (as before) and now IPv6 as well. It can automatically access IPv4 or IPv6 addresses on the Internet just as the Blu-ray player can automatically play BD or DVD disks. That's backwards compatible.
Making an "IPv6 only" machine is like taking out the DVD laser from a blu-ray player and making a "blue-ray only" disc player. Yes, that would be non backwards compatible, so, duh, don't do that!
I think that makes for a good analogy...
IPv6/IPv4 backwards compatibility
Subscribe to: Post Comments (Atom)
I am, once again, getting more spam. Someone must have put my email on some mailing list. This is a pain in the arse, takes up my time, and ...
Broadband services are a wonderful innovation of our time, using multiple frequency bands (hence the name) to carry signals over wires (us...
It seems there is something of a standard test string for anti virus ( wikipedia has more on this). The idea is that systems that look fo...
For many years I used a small stand-alone air-conditioning unit in my study (the box room in the house) and I even had a hole in the wall fo...
...just like a DVD player can play CDs ;-) (actually, that's more like "yes, it's backward compatible, you don't have to upgrade your network card!")ReplyDelete
What about with DNS64 and NAT64?ReplyDelete
Well, yes, we discussed those as well...ReplyDelete
One of the reason I hate analogies as you start speaking in terms of the analogy instead of the problem :(ReplyDelete