In message <5005E87D.6060006@unfix.org>, Jeroen Massar writes:
On 2012-07-18 00:21, Seth Mattinen wrote: [..]
Don't, because there's already a /10 defined for such things. It's called ULA (unique local address) aka RFC 4193. ULAs are not globally routable.
Here's a calculator that will generate a random one for you:
A random one indeed, because the javascript for it is just: 8<----------------------------------------------------- var calc_private = function() {
var str = "fd";
for(i = 0; i<10; i++) { str = str + toHex(Math.floor(Math.random()*16)); if (i % 4 == 1) str = str + ":"; }
$("#private_subnet").html("Your private subnet is: <code>"+str+":/48</code>"); $("#multicast1").val(str+":/48"); calc_multicast1(); ------------------------------------------------------->8
does not follow RFC4193 in any way at all. A such do not use it.
If you have a true random number source you don't need to use the method in RFC4193. The method in RFC4193 is designed to get produce a good enough pseudo source of randomness.
The original real RFC4193 ULA generator script can be found at: http://www.kame.net/~suz/gen-ula.html
google(ipv6 ula) for another page, that has been referenced often enough on this very list already, if you want to 'register' it there to avoid another small chance of collision, that page also uses the script from the above site for a true RFC4193 prefix.
Greets, Jeroen
-- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: marka@isc.org