DHCP and Router Redundancy

Hello,

I am setting up a new Windows 2003 Domain using technologies like DHCP, DNS,
AD, WSS etc.

We currently have 2 routers providing Internet access, and when one of them
goes offline we have to manually tell our users to use the other one.

When we installing our AD, our users will not have sufficent rights to
change the rouer in network configuration.

With DHCP, we can have our router string saying the primary router however,
suppose our primary router goes down can we simply switch that string to say
our secondary router and then force a DHCP update on the clients?

I am trying to have some form of automated redundancy for routers.

Thanks,

No. It is not possible. This has to be done by bringing both WAN links into
the same Device. This means throw out the two broadband devices and buy a
single one that has 2 WAN Ports and has be designed to do this type of job.


--
Phillip Windell
www.wandtv.com

The views expressed, are my own and not those of my employer, or Microsoft,
or anyone else associated with me, including my cats.
-----------------------------------------------------
Understanding the ISA 2004 Access Rule Processing
http://www.isaserver.org/articles/IS...cessRules.html

Troubleshooting Client Authentication on Access Rules in ISA Server 2004
http://download.microsoft.com/downlo...7/ts_rules.doc

Microsoft Internet Security & Acceleration Server: Partners
http://www.microsoft.com/isaserver/partners/default.asp

Microsoft ISA Server Partners: Partner Hardware Solutions
http://www.microsoft.com/forefront/e...epartners.mspx
-----------------------------------------------------

"AU" <(E-Mail Removed)> wrote in message
news:ECA2BAA2-268C-4D1B-9DC3-(E-Mail Removed)...
> Hello,
>
> I am setting up a new Windows 2003 Domain using technologies like DHCP,
> DNS,
> AD, WSS etc.
>
> We currently have 2 routers providing Internet access, and when one of
> them
> goes offline we have to manually tell our users to use the other one.
>
> When we installing our AD, our users will not have sufficent rights to
> change the rouer in network configuration.
>
> With DHCP, we can have our router string saying the primary router
> however,
> suppose our primary router goes down can we simply switch that string to
> say
> our secondary router and then force a DHCP update on the clients?
>
> I am trying to have some form of automated redundancy for routers.
>
> Thanks,
>

If I use the Router 03 scope option, I would list my routers in perference,
the first would be my primary and the next would be my secondary.

How would Windows know when to use my secondary router?

"Phillip Windell" wrote:

> No. It is not possible. This has to be done by bringing both WAN links into
> the same Device. This means throw out the two broadband devices and buy a
> single one that has 2 WAN Ports and has be designed to do this type of job.
>
>
> --
> Phillip Windell
> www.wandtv.com
>
> The views expressed, are my own and not those of my employer, or Microsoft,
> or anyone else associated with me, including my cats.
> -----------------------------------------------------
> Understanding the ISA 2004 Access Rule Processing
> http://www.isaserver.org/articles/IS...cessRules.html
>
> Troubleshooting Client Authentication on Access Rules in ISA Server 2004
> http://download.microsoft.com/downlo...7/ts_rules.doc
>
> Microsoft Internet Security & Acceleration Server: Partners
> http://www.microsoft.com/isaserver/partners/default.asp
>
> Microsoft ISA Server Partners: Partner Hardware Solutions
> http://www.microsoft.com/forefront/e...epartners.mspx
> -----------------------------------------------------
>
> "AU" <(E-Mail Removed)> wrote in message
> news:ECA2BAA2-268C-4D1B-9DC3-(E-Mail Removed)...
> > Hello,
> >
> > I am setting up a new Windows 2003 Domain using technologies like DHCP,
> > DNS,
> > AD, WSS etc.
> >
> > We currently have 2 routers providing Internet access, and when one of
> > them
> > goes offline we have to manually tell our users to use the other one.
> >
> > When we installing our AD, our users will not have sufficent rights to
> > change the rouer in network configuration.
> >
> > With DHCP, we can have our router string saying the primary router
> > however,
> > suppose our primary router goes down can we simply switch that string to
> > say
> > our secondary router and then force a DHCP update on the clients?
> >
> > I am trying to have some form of automated redundancy for routers.
> >
> > Thanks,
> >
>
>
>

"AU" <(E-Mail Removed)> wrote in message
news:7ADF24F5-9EC4-415A-9B25-(E-Mail Removed)...
> If I use the Router 03 scope option, I would list my routers in
> perference,
> the first would be my primary and the next would be my secondary.
>
> How would Windows know when to use my secondary router?

It won't if the line is all that is going down. The router would still be
running and the path would still continue to be considered valid. If you
powered off the Router then Windows *might* switch. But even if it does,
once the line comes back up and you power the router back up,...Windows will
not switch back to it and will continue to use the second one.

128978 - Dead Gateway Detection in TCP/IP for Windows NT
http://support.microsoft.com/default...b;EN-US;128978

171564 - TCP/IP Dead Gateway Detection Algorithm Updated for Windows NT
http://support.microsoft.com/default...b;EN-US;171564


Save your self a bunch of trouble and just buy a 2-WAN Port "router" that
was designed to do what you ant to do.

--
Phillip Windell
www.wandtv.com

The views expressed, are my own and not those of my employer, or Microsoft,
or anyone else associated with me, including my cats.
-----------------------------------------------------

Hi,

That document seems to be abit confusing... lol, we just bought a new Cisco
router, I don't think they are willing to purhase anymore equipment.

Is that all my options?

With regards to the dead router stuff, that only effects the router on the
server, but what about the client I want to let the clients switch to the
other router.



"Phillip Windell" wrote:

> "AU" <(E-Mail Removed)> wrote in message
> news:7ADF24F5-9EC4-415A-9B25-(E-Mail Removed)...
> > If I use the Router 03 scope option, I would list my routers in
> > perference,
> > the first would be my primary and the next would be my secondary.
> >
> > How would Windows know when to use my secondary router?
>
> It won't if the line is all that is going down. The router would still be
> running and the path would still continue to be considered valid. If you
> powered off the Router then Windows *might* switch. But even if it does,
> once the line comes back up and you power the router back up,...Windows will
> not switch back to it and will continue to use the second one.
>
> 128978 - Dead Gateway Detection in TCP/IP for Windows NT
> http://support.microsoft.com/default...b;EN-US;128978
>
> 171564 - TCP/IP Dead Gateway Detection Algorithm Updated for Windows NT
> http://support.microsoft.com/default...b;EN-US;171564
>
>
> Save your self a bunch of trouble and just buy a 2-WAN Port "router" that
> was designed to do what you ant to do.
>
> --
> Phillip Windell
> www.wandtv.com
>
> The views expressed, are my own and not those of my employer, or Microsoft,
> or anyone else associated with me, including my cats.
> -----------------------------------------------------
>
>
>

"AU" <(E-Mail Removed)> wrote in message
news:A9549A93-0537-4A10-B30C-(E-Mail Removed)...
> That document seems to be abit confusing... lol,

Exactly.

> we just bought a new Cisco
> router, I don't think they are willing to purhase anymore equipment.

They aren't that expensive. A tank of gas in the car probably costs more.

> Is that all my options?

Yes.

> With regards to the dead router stuff, that only effects the router on the
> server, but what about the client I want to let the clients switch to the
> other router.

No. The behavor is the way the OS on every machine behaves. Every machine
on the LAN would have to have the two Gateways listed, and every machine on
the LAN would behave in the crappy confusing way described in the Articles.