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NLB for hub & CAS -exchange  2007

Posted on 2009-04-04
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Last Modified: 2012-05-06
hi
we have two mail box servers in ccr on exchange 2007. Now i am configuring an NLB for my two hub/cas servers. I noticed in some documentations that they are giving public and nlb on the same network. For example my public network is in Class C, 192.168.1.0 is it suggested to give the same subnet for the NLB as well
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Question by:mishalk
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Expert Comment

by:kyodai
ID: 24066774
You can also put them in different networks - in my eyes this would also be the cleaner solution. This however requires you to also have a routing strategy between the networks making implementation maybe harder if you only administrate the servers not the network. I can only assume the made this recommendation to keep implementation easier.
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Expert Comment

by:Kaffiend
ID: 24070367
Nothing wrong with the cluster's IP address being on the same subnet.

It's a "Best Practice" that the heartbeat be on a separate subnet.
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LVL 32

Expert Comment

by:gupnit
ID: 24071815
Hi,
It all depends upon you scenario and what availability you want. It is always recommended to have both networks seperate. If you have some resource crunch, then go ahead and use the same network
Cheers
Nitin Gupta (gupnit)
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Author Comment

by:mishalk
ID: 24074438
hi nitin
i did complete the nlb configuration
 and this is my config
"      Hub-Cas1
--------------
Public
NIC IP : 192.168.1.104/255.255.255.0
DNS   :  192.168.1.20
 
NLB
NIC IP  : 192.168.1.109 / 255.255.255.0
No DNS and No GW
 
Hub-Cas2
----------------
Public
Nic IP : 192.168.1.105/255.255.255.0
DNS   : 10.0.0.2
 
NLB
NIC IP : 192.168.1.110 /255.255.255.0
No DNS and NO GW
 
NLB Virtual name : webmail.domain.local
NLB Virtual  IP     : 192.168.1.111


now i am able to access : webmail.domain.local/owa , but only from the 192.168.1.0/255.255.255.0 network. If i ping from any other internal network i am getting time out. I have selected multicast while configuring NLB.

my nlb network card cables are also coming from the same switch of my public nic card. Instead of that do i need to do a card to card cross over or ? please help us
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Author Comment

by:mishalk
ID: 24074479
sorry , on hub-cas02, i typed the dns wrong..i kept the correct dns entry in my configuration
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LVL 32

Expert Comment

by:gupnit
ID: 24076394
Hi,
If other subnets are unable to connect to your CAS server, then first you got to look at Network Routing and whether routing is enabled or not. Check your DNS too.
I have not looked at your NLB feasibility yet, if you can confirm above, then we can look at the NLB, as first the internal routing needs to be in place.
Cheers
Nitin
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Accepted Solution

by:
mishalk earned 0 total points
ID: 24085216
hi nitin
when i changed from multicast to unicast, it is able to reach from any vlan we have configured in the switch. And now we are able to resolve the name and ip as well
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Author Comment

by:mishalk
ID: 24085220
nitin
i was able to reach the cas server from any vlan, the problem was reaching the virtual host name and the virtual ip
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LVL 32

Expert Comment

by:gupnit
ID: 24087950
Hi,
You mean to say that even pinging by IP is not working. Are you sure you are able to ping from same LAN subnet
Thanks
Nitin
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Author Comment

by:mishalk
ID: 24094578
yes, i can ping from same lan, but as  i mentioned earlier i am able to ping from any vlan after changing to multicast to unicast
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