Re: Specifying an IPv6 suffix

[Robert Moskowitz <rgm htt-consult com>]

On 11/05/2010 10:43 AM, Marc Herbert wrote:
> Le 04/11/2010 18:02, Robert Moskowitz a écrit :
>    
> > I want to control the IPv6 suffix for my interfaces and let the prefix
> > be set with RA.
> >
> > Currently I can either have the RA prefix with the MAC address for the
> > suffix, or I can specify a complete IPv6 address (and gateway) and
> > ignore RA (doing this manually in the ifcfg-eth0 file as I don't see how
> > to do this with Network manager).
> >
> > The first approach causes problems with DNS if I change the interface.
> >      
> Do you change the network interface that often? Updating the DNS once
> in a while does not look like a huge burden.
>    

It is the principle of the thing.  Yes, if I am changing my prefix I 
have to change the DNS.  But if I am only changing the hardware, why am 
I having to change the DNS?
> You could force the old MAC address on the new interface. Of course if
> you still use the old interface elsewhere you will be in trouble.
>    

The old mapping of MAC addresses has always been old from the days that 
I was dealing with this back on 3COM 501C cards and SUN servers.

>    
> > The second approach causes problems if I change the network prefix.
> >      
> ... and you still have the same DNS problem in this case, right?
>    

If you are changing prefixes, there are LOTs of things in DNS that are 
impacted.  It is a pain; I have done it for IPv4 (but not for a few 
years).  But much of IPv6 was to 'automate' readdressing for the 
systems.  So we have the ability to use MAC addresses as part of the 
address.  What I am saying is to add flexiblity so that other suffixes 
can be use.

> You seem to have an incredibly dynamic network environment, can you
> give more details about it?
>
>
> PS: this does not look specific to IPv6
>
>