Re: IPv6 Deployment for Mobile Subscribers

[Carsten Bormann <cabo () tzi org>]

RFC 6177:

   This document obsoletes RFC 3177, updating its recommendations in the
   following ways:

      1) It is no longer recommended that /128s be given out.  While
         there may be some cases where assigning only a single address
         may be justified, a site, by definition, implies multiple
         subnets and multiple devices.

Generally, when you look at an obsolete document such as

https://tools.ietf.org/html/rfc3177

there is a link to the current version ("Obsoleted by: 6177"):

https://tools.ietf.org/html/rfc6177

Do not use websites showing RFCs that do not show this information;
you'll be stuck with outdated specifications.

Grüße, Carsten


Ricardo Ferreira wrote:
> Is there anyone here working in an ISP where IPv6 is deployed?
> We are starting to plan the roll-out IPv6 to mobile subscribers (phones) I
> am interesting in knowing the mask you use for the assignment; whether it
> is /64 or /128.
>
> In RFC 3177, it says:
> 3. Address Delegation Recommendations
>
>    The IESG and the IAB recommend the allocations for the boundary
>    between the public and the private topology to follow those general
>    rules:
>
>       -  /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.
>
> Basically a sole device will be connecting to the internet so I am
> wondering if this rule is follwed.
>
> Cheers