IPv6 routing /48s

Wed Nov 19 22:38:27 UTC 2008

Michael Sinatra wrote:
> If your reference to 2001:: addressing simply means "non-tunneled, 
> globally routable IPv6 addressing," then I suppose it is okay.  But 
> please note that there is now a lot of native (non-tunneled), globally 
> routable IPv6 addressing that is outside of 2001::/16.  ARIN, for 
> example, is allocating blocks out of 2607::/16 and there are quite a 
> large number of prefixes elsewhere in the designated globally-routable 
> 2000::/3 that are *not* 6to4 addresses.
> 

heh, these days, lots of it is still tunneled, though through more 
conventional means. But yes, I should have been more clear. Just too 
used to seeing 2001::/16 and too lazy to figure out the proper 
terminology (The original topic is something I've been heavily testing 
lately while I figure out how closely I can get to customer edges and 
how they will react).

> The reason I bring this up is that I have already seen certain 
> applications, such as one for registering AAAA records for DNS servers 
> in a certain TLD, that don't allow anything other than 2001::/16. 
> (Fortunately that application was fixed quickly when those responsible 
> were notified.)  Just making sure others aren't careening toward making 
> the same mistake.

Agreed, and thanks for correcting my post. Would hate for others to take 
my offhanded comments on addressing and use them in production apps.

Jack