[ppml] Proposed Policy: PI assignments for V6

Stephen Sprunk stephen at sprunk.org
Wed Dec 8 14:09:15 EST 2004

Thus spake "marcelo bagnulo braun" <marcelo at it.uc3m.es>
> so, i guess that the right thing to do would be to assign a /48 to each 
> mobile phone, right?
> since RFC 3177 states that:
>       -  /48 in the general case, except for very large subscribers.
>       -  /64 when it is known that one and only one subnet is needed by
>          design.
>       -  /128 when it is absolutely known that one and only one device
>          is connecting.
> and since  we cannot be sure that a mobile phone will have a single 
> subnetwork behind, i guess that the /48 would be the proper choice
> I am sorry but i think this is a huge waste.
> For the time being, most of mobile phones will not have a manet behind, 
> not one not many subnetworks. I think there must be something very wrong 
> if we assign a /48 to each mobile phone

Do mobile phones even count as an "assignment"?  i.e. will ISPs be assigning 
a static prefix to each customer, regardless of location, and putting SWIP 
info in WHOIS?  I admit I'm not familiar with what the telcos are planning, 
but this seems ridiculous.

I would expect each cell tower (or whatever the logical unit is) to be 
assigned a /64, and phones would be individual hosts with addresses provided 
by DHCP or autoconfiguration.  If a phone allowed hosts behind it, they 
could be bridged into that same subnet.


Stephen Sprunk         "God does not play dice."  --Albert Einstein
CCIE #3723         "God is an inveterate gambler, and He throws the
K5SSS        dice at every possible opportunity." --Stephen Hawking 

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