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date: Wed, 13 Feb 2008 13:37:01 -0800,
group: microsoft.public.exchange.clustering
back
Re: NLB over wan with Windows 2008 Server for CAS role
On Wed, 13 Feb 2008 17:12:55 -0500, "Mark Arnold [MVP]"
wrote:
>On Wed, 13 Feb 2008 13:37:01 -0800, Lehr
> wrote:
>
>>Is it possible to set up NLB cluster via WAN link with windows 2008 server ?
>>That's important to me because we are going to implement Exchange CCR
>>cluster (for Mailbox) over WAN with win2k8, and we also need to provide high
>>availability for Exchange Client Access, with one in Location A, and second
>>in Location B, linked via WAN.
>>So I wonder is it possible to do that with NLB cluster
>>
>>Maybe it is enogh to make two same CNAME records with different IP's(1 in
>>subnet Location A, and second in subnet Location B) ?
>>
>>Thank you!
>
>No, not really. You need to address your resilience design because
>that doesn't sound too clever right now.
Yea, NLB is not simply a DNS modification.
date: Wed, 13 Feb 2008 17:20:44 -0500
author: Andy David {MVP}
Re: NLB over wan with Windows 2008 Server for CAS role
"Mark Arnold [MVP]" wrote:
> On Wed, 13 Feb 2008 13:37:01 -0800, Lehr
> wrote:
>
> >Is it possible to set up NLB cluster via WAN link with windows 2008 server ?
> >That's important to me because we are going to implement Exchange CCR
> >cluster (for Mailbox) over WAN with win2k8, and we also need to provide high
> >availability for Exchange Client Access, with one in Location A, and second
> >in Location B, linked via WAN.
> >So I wonder is it possible to do that with NLB cluster
> >
> >Maybe it is enogh to make two same CNAME records with different IP's(1 in
> >subnet Location A, and second in subnet Location B) ?
> >
> >Thank you!
>
> No, not really. You need to address your resilience design because
> that doesn't sound too clever right now.
OK, I thought so...
And what about putting two same CNAME records in with different IP ?
One IP for CAS1 in Location A, and second IP for CAS2 in Location B.
Would that provide HA in case one of the CAS servers goes down?
thanks!
date: Wed, 13 Feb 2008 15:02:02 -0800
author: Lehr
Re: NLB over wan with Windows 2008 Server for CAS role
On Wed, 13 Feb 2008 15:02:02 -0800, Lehr
wrote:
>
>
>"Mark Arnold [MVP]" wrote:
>
>> On Wed, 13 Feb 2008 13:37:01 -0800, Lehr
>> wrote:
>>
>> >Is it possible to set up NLB cluster via WAN link with windows 2008 server ?
>> >That's important to me because we are going to implement Exchange CCR
>> >cluster (for Mailbox) over WAN with win2k8, and we also need to provide high
>> >availability for Exchange Client Access, with one in Location A, and second
>> >in Location B, linked via WAN.
>> >So I wonder is it possible to do that with NLB cluster
>> >
>> >Maybe it is enogh to make two same CNAME records with different IP's(1 in
>> >subnet Location A, and second in subnet Location B) ?
>> >
>> >Thank you!
>>
>> No, not really. You need to address your resilience design because
>> that doesn't sound too clever right now.
>
>OK, I thought so...
>
>And what about putting two same CNAME records in with different IP ?
>One IP for CAS1 in Location A, and second IP for CAS2 in Location B.
>Would that provide HA in case one of the CAS servers goes down?
And if one of those servers goes down, what provides the ability to
route client requests only to the server that is up?
>
>thanks!
date: Wed, 13 Feb 2008 18:08:45 -0500
author: Andy David {MVP}
Re: NLB over wan with Windows 2008 Server for CAS role
"Lehr" wrote in message
news:ACA4F68C-016D-4E1B-BE4F-C9D895BB9B00@microsoft.com...
> Is it possible to set up NLB cluster via WAN link with windows 2008 server
> ?
Each node in an NLB cluster has to be in the same network segment. So, if
you configure a VLAN spanning sites, then you could do that.
> That's important to me because we are going to implement Exchange CCR
> cluster (for Mailbox) over WAN with win2k8,
You realize, of course, that each node in a CCR cluster has to be in the
same AD site, right?
> and we also need to provide high
> availability for Exchange Client Access, with one in Location A, and
> second
> in Location B, linked via WAN.
> So I wonder is it possible to do that with NLB cluster
Yes, it is, but it will require using a VLAN.
> Maybe it is enogh to make two same CNAME records with different IP's(1 in
> subnet Location A, and second in subnet Location B) ?
Nope, that won't work. Sorry.
--
Russ Kaufmann
MVP - Windows Server - Clustering
ClusterHelp.com, a Microsoft Certified Gold Partner
Web http://www.clusterhelp.com
Blog http://msmvps.com/clusterhelp
The next ClusterHelp classes are:
Mar 10- 13 in Denver
May 12-15 in New York
date: Wed, 13 Feb 2008 16:11:56 -0700
author: Russ Kaufmann [MVP]
Re: NLB over wan with Windows 2008 Server for CAS role
"Andy David {MVP}" wrote:
> On Wed, 13 Feb 2008 15:24:01 -0800, Lehr
> wrote:
>
> >
> >
> >"Russ Kaufmann [MVP]" wrote:
> >
> >> "Lehr" wrote in message
> >> news:6804FF0C-E140-490F-A569-91B3B1A7C1E2@microsoft.com...
> >> > And what about putting two same CNAME records in with different IP ?
> >> > One IP for CAS1 in Location A, and second IP for CAS2 in Location B.
> >> > Would that provide HA in case one of the CAS servers goes down?
> >>
> >> Nope. That would be the same thing as doing DNS round robin. It is not an HA
> >> solution. If one server were to fail, half of the traffic would still be
> >> directed to it.
> >>
> >
> >And if we turn off round robin in DNS? hm
>
> Then it still wont work. Unless you remove the downed servers ip from
> the CNAME and then wait for client TTL to expire.
>
> Why not just build the NLB correctly using the NLB features of Windows
> or a 3rd party solution?
My question was is it possible to build NLB with two nodes in different
subnets, and I got the answer that it is not.
But...maybe I'm wrong...but I still think it's going to work...
In that case NLB is going to have two IP adressess, one from NODE A subnet,
and one from NODE B subnet, right? And when the client requests IP for, NLB,
he will get
IP from his local subnet, and that will work if round robin is turned off in
DNS.
And if one of nodes goes down, NLB would know that and everything goes to
other node.
Am I wrong?
date: Wed, 13 Feb 2008 23:16:04 -0800
author: Lehr
Re: NLB over wan with Windows 2008 Server for CAS role
"Lehr" wrote in message
news:5116581F-AEB3-4474-BE8A-23041C719A83@microsoft.com...
>> >> > And what about putting two same CNAME records in with different IP ?
>> >> > One IP for CAS1 in Location A, and second IP for CAS2 in Location B.
>> >> > Would that provide HA in case one of the CAS servers goes down?
>> >>
>> >> Nope. That would be the same thing as doing DNS round robin. It is not
>> >> an HA
>> >> solution. If one server were to fail, half of the traffic would still
>> >> be
>> >> directed to it.
>> >>
>> >
>> >And if we turn off round robin in DNS? hm
>>
>> Then it still wont work. Unless you remove the downed servers ip from
>> the CNAME and then wait for client TTL to expire.
>>
>> Why not just build the NLB correctly using the NLB features of Windows
>> or a 3rd party solution?
>
> My question was is it possible to build NLB with two nodes in different
> subnets, and I got the answer that it is not.
> But...maybe I'm wrong...but I still think it's going to work...
OK, then why bother asking... <G> Test it for yourself, if that is what it
takes to convince you.
> In that case NLB is going to have two IP adressess, one from NODE A
> subnet,
> and one from NODE B subnet, right? And when the client requests IP for,
> NLB,
> he will get
> IP from his local subnet, and that will work if round robin is turned off
> in
> DNS.
> And if one of nodes goes down, NLB would know that and everything goes to
> other node.
>
> Am I wrong?
Yes, it won't work, but feel free to try it.
--
Russ Kaufmann
MVP - Windows Server - Clustering
ClusterHelp.com, a Microsoft Certified Gold Partner
Web http://www.clusterhelp.com
Blog http://msmvps.com/clusterhelp
The next ClusterHelp classes are:
Mar 10- 13 in Denver
May 12-15 in New York
date: Thu, 14 Feb 2008 23:22:14 -0700
author: Russ Kaufmann [MVP]
Re: NLB over wan with Windows 2008 Server for CAS role
OK, you convinced me :)
"Russ Kaufmann [MVP]" wrote:
> "Lehr" wrote in message
> news:5116581F-AEB3-4474-BE8A-23041C719A83@microsoft.com...
> >> >> > And what about putting two same CNAME records in with different IP ?
> >> >> > One IP for CAS1 in Location A, and second IP for CAS2 in Location B.
> >> >> > Would that provide HA in case one of the CAS servers goes down?
> >> >>
> >> >> Nope. That would be the same thing as doing DNS round robin. It is not
> >> >> an HA
> >> >> solution. If one server were to fail, half of the traffic would still
> >> >> be
> >> >> directed to it.
> >> >>
> >> >
> >> >And if we turn off round robin in DNS? hm
> >>
> >> Then it still wont work. Unless you remove the downed servers ip from
> >> the CNAME and then wait for client TTL to expire.
> >>
> >> Why not just build the NLB correctly using the NLB features of Windows
> >> or a 3rd party solution?
> >
> > My question was is it possible to build NLB with two nodes in different
> > subnets, and I got the answer that it is not.
> > But...maybe I'm wrong...but I still think it's going to work...
>
> OK, then why bother asking... <G> Test it for yourself, if that is what it
> takes to convince you.
>
> > In that case NLB is going to have two IP adressess, one from NODE A
> > subnet,
> > and one from NODE B subnet, right? And when the client requests IP for,
> > NLB,
> > he will get
> > IP from his local subnet, and that will work if round robin is turned off
> > in
> > DNS.
> > And if one of nodes goes down, NLB would know that and everything goes to
> > other node.
> >
> > Am I wrong?
>
> Yes, it won't work, but feel free to try it.
>
>
> --
> Russ Kaufmann
> MVP - Windows Server - Clustering
> ClusterHelp.com, a Microsoft Certified Gold Partner
> Web http://www.clusterhelp.com
> Blog http://msmvps.com/clusterhelp
>
> The next ClusterHelp classes are:
> Mar 10- 13 in Denver
> May 12-15 in New York
>
date: Sat, 16 Feb 2008 00:24:00 -0800
author: Lehr
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