building a DNS system

[bru']

Stephane Bortzmeyer wrote:
> On Mon, Jul 17, 2006 at 11:27:43AM -0700,
>  vincentbruno at free.fr <vincentbruno at free.fr> wrote
>  a message of 47 lines which said:
>
> > http will be handled by IP_OF_PRIMARY_SERVEUR which is down -> no
> > web forwarding available.
> >
> > What is the solution ?
>
> This is not a DNS issue and has nothing to do with BIND.
>
> Since no HTTP client support SRV records :-( you have to provide
> redundancy elsewhere. (For instance with CARP or similar techniques.)

Do you agree that zone files must be identicals between nameservers
(primary and secondary) ? 

What is CARP ?