Null realms and servers

Derek Atkins warlord at MIT.EDU
Tue Dec 19 10:47:37 EST 2006

Nicolas Williams <Nicolas.Williams at> writes:

>  - I've convinced Sam that the fallback host2realm algorithm that I
>    described, in conjunction with referrals, will be very useful.
>    Specifically the algorithm we propose allows zero-configuration
>    clients to prosper in any environment that has the following
>    characteristics:
>     - Realm names correspond to DNS domain names, but without
>       necessarily having a sub-realm for every sub-domain.  E.g.,

How do you determine the base domain for a realm hierarchy?
E.g. what kind of algorithm do you use to decide whether
w.x.y.z maps to Y.Z or X.Y.Z?  For example, how would you
handle  Or even
Obviously you wouldn't want this to map to domain AC.UK.

How do you algorithmically differentiate between

       Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
       Member, MIT Student Information Processing Board  (SIPB)
       URL:    PP-ASEL-IA     N1NWH
       warlord at MIT.EDU                        PGP key available

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