[ds6] ds6 now accessible from 6net

[Peter Bieringer]

--On Tuesday, July 01, 2003 08:41:03 PM +0200 Simone Piunno
<simone at deepspace6.net> wrote:

> On Tuesday 01 July 2003 15:08, Dr. Peter Bieringer wrote:
> 
>> > just because this address was auto-generated doesn't mean it's bound
>> > to the NIC.  Actually, both addresses (6bone and 6net) are statically
>> > configured and would be used even if we replace the interface.
>> 
>> If so, it "violates" the standard, because automatic generated ones
>> should't be assigned manually:
>> Solution: invert the universal/global bit...
> 
> From RFC2373:
> 
>    EUI-64 based Interface identifiers may have global
>    scope when a global token is available (e.g., IEEE 48bit MAC) or may
>    have local scope where a global token is not available (e.g., serial
>    links, tunnel end-points, etc.).  It is required that the "u" bit
>    (universal/local bit in IEEE EUI-64 terminology) be inverted when
>    forming the interface identifier from the EUI-64.  The "u" bit is set
>    to one (1) to indicate global scope, and it is set to zero (0) to
>    indicate local scope.  The first three octets in binary of an EUI-64
>    identifier are as follows:
> 
>        0       0 0       1 1       2
>       |0       7 8       5 6       3|
>       +----+----+----+----+----+----+
>       |cccc|ccug|cccc|cccc|cccc|cccc|
>       +----+----+----+----+----+----+
> 
> So you want me to reset the u bit therefore indicating our address is
> local  scope? 

Yes.

> It doesn't sound quite good because our token *is* global
> (e.g. IEEE  48bit MAC)

Sure, but if you put the NIC where you first got this token into another
box on the same layer-2 net, this box will be in trouble on autoconf.

> but ok, if you think this is required I've set the
> refresh time  for AAAA records to 5 minutes and I'll switch tomorrow in
> the evening.

I'm not sure whether it's required, but it's for avoiding headaches.

        Peter
-- 
Dr. Peter Bieringer                     http://www.bieringer.de/pb/
GPG/PGP Key 0x958F422D               mailto: pb at bieringer dot de 
Deep Space 6 Co-Founder and Core Member  http://www.deepspace6.net/