In message <[email protected]>, 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: > > > > http://bitace.com/ipv6calc/ > > 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: [email protected]
