Hi,

I have been let down by my internet supplier. We are moving premises and I
ordered my leased line over three months ago. We are moving in next Monday
12th and everything needs to be up and running. Everything was in place to
have the servies up and running this Wednesday 7th Mar. However, they have
hit a snag and now the services will only be up and running on the 13th Mar.

I very clevererly went and installed an ADSL 8meg line as a backup a while
ago. The ADSL line has one static IP address assigned. I believe I can
configure my router/firewall to provide internet and email (in and out) for
my domain using that one IP address. What I am not sure of is if you can
configure DNS in such a way that one host has two IP addresses, the first
being the primary and the second being the failover address (kinda like MX
can provide failover, I want to do the same for a Host to IP). Please tell
me this is possible. If it is, is there a specail type of record that is
created? Do you simply add another host to the zone with the same name but
a different IP (and then which does it use first)?

TIA,

Jarryd

"Jarryd" <jarryd@community.nospam> wrote in message
news:ugFKL%23jYHHA.4872@TK2MSFTNGP03.phx.gbl...
> Hi,
>
> I have been let down by my internet supplier. We are moving premises and
> I ordered my leased line over three months ago. We are moving in next
> Monday 12th and everything needs to be up and running. Everything was in
> place to have the servies up and running this Wednesday 7th Mar. However,
> they have hit a snag and now the services will only be up and running on
> the 13th Mar.
>
> I very clevererly went and installed an ADSL 8meg line as a backup a while
> ago.

Good move.

> The ADSL line has one static IP address assigned. I believe I can
> configure my router/firewall to provide internet and email (in and out)
> for my domain using that one IP address.

Almost certainly. You could also just rent a GoDaddy server for a month
or so. Either a virtual one or a dedicated one is quite affordable.

>What I am not sure of is if you can configure DNS in such a way that one
>host has two IP addresses, the first being the primary and the second being
>the failover address (kinda like MX can provide failover, I want to do the
>same for a Host to IP).

What you say is possible in DNS , but the problem is that practically no
network
CLIENT will use those as failovers -- except for Mail Exchange clients.

> Please tell me this is possible. If it is, is there a specail type of
> record that is created? Do you simply add another host to the zone with
> the same name but a different IP (and then which does it use first)?

You can do that, and the one listed first WOULD be used by most clients
first and only -- but you can also enabled DNS "Round Robing" so that they
rotate being returned first.

Problem with "Round Robin" DNS is that it is larely just for (pseudo) Load
Balancing and doesn't really offer in fault tolerance.

What you want is "NLB" (or sometimes clustering.) If you lease two
GoDaddy servers on the same subnet you could easily set them in either
(not both) an NLB or Server Cluster.

NLB is largely used for Web, Terminal Servers, VPN servers, and most
"Internet style" services such as SMTP, POP etc.

Server Clusters are used for "Microsoft" type services such as Exchange,
SQL Server, File, Print - as well as DHCP.

--
Herb Martin, MCSE, MVP
http://www.LearnQuick.Com
(phone on web site)