[6bone] v6 and ADSL

[Fred Templin]

Sorry for the late reply, due to being out of the office. See points for
clarification below:

Tina Strauf (JOIN Projekt Team) wrote:

>Of course, what you say is true. Once you have an IPv6 connection to one
>client whithin your net either natively, by ISATAP, normal configured
>IPv6-in-IPv4-tunnel or 6to4 you can do with that whatever you want and
>even get (another) prefix routed through it for addressing the rest of
>the machines in the network. The original ISATAP client would then have
>to be configured as IPv6 default gateway for the rest of the hosts etc.
>
What you say above is correct.

>But afaik ISATAP was not especially designed for that purpose or
>otherwise it would have included a (global) prefix being
>delegated/assigned to the client as is the case with 6to4.
>
6to4 uses a special prefix that embeds a global IPv4 address to be used
for tunneling; 6to4 can be used if and only if the provider assigns the
residential gateway a global IPv4 address.

You are correct that ISATAP does not use such a special prefix, but
ISATAP does not use any information in the prefix for tunneling
purposes. ISATAP can in fact use any type of prefix, including
native IPv6 and 6to4.

>Your idea
>might also a bit hard to do or at least requires some additional
>scripting, at least if the client on the dialed-in part of the net
>obtains a different IPv4-address every time. You might have to set up
>the static route for the prefix on each dial-up anew.
>
Not sure where you mean about the static route being needed. The prefix is
assigned to the ISATAP client on the residential gateway, e.g. via DHCPv6
prefix delegation from the service provider. Then, hosts that are using the
ISATAP client as the IPv6 default gateway can configure addresses as
specified in RFC 2462.

Fred
ftemplin@iprg.nokia.com

>
>Cheers,
>
>Tina Strauf
>
>Am Mit, 2003-07-23 um 19.16 schrieb Fred Templin:
>  
>
>>I've been trying to get the word out on this, but perhaps it needs to be
>>mentioned again. ISATAP can be used to connect a whole net; not just
>>a single client as claimed below. For example, a residential gateway
>>can configure an ISATAP client interface on it's link to the ISP and an
>>ISATAP routing interface (and/or a native IPv6 routing interface) on
>>it's link to the home network. The home network can have arbitrarily
>>many clients; not just a single client.
>>
>>The only other requirement in this case is that the residential gateway
>>procure a prefix delegation for advertisement on the home network.
>>The delegation could come from the ISP (e.g., through DHCPv6
>>prefix delegation) or through some fictitious provider-independent
>>addressing scheme.
>>    
>>