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Home » Microsoft » Windows Server » Server Clustering » Windows Network Load Balancing not behaving properly
Windows Network Load Balancing not behaving properly [message #443404] Fri, 07 May 2010 03:07
helphelphelp  is currently offline helphelphelp  United States
Messages: 1
Registered: May 2010
Junior Member
Hi,

I have an issue with Windows NLB and I'm not sure if it should be
behaving like it is right now. Basically, I installed Windows Server
2008 R2 on two VMs using ESXi 4. Installed IIS and NLB on both servers.
Set one server's priority to 1 (Server A)) and the other's to 2 (Server
B). All ports allowed and affinity set to single. Communication set to
multicast. I tested access using another VM on the same network.

[Affinity=Single]
With both servers online, I telnet to the cluster IP and hostname on
port 80. No problems.
Then I brought Server A offline. Server B remains online. Telnet fails
on both cluster IP and hostname.
Next, I brought Server A online and Server B offline. Telnet sometimes
work and sometimes fail on both cluster IP and hostname. Seems
unstable.

[Affinity=None]
With both servers online, I telnet to the cluster IP a nd hostname on
port 80. No problems.
With Server A offline and Server B online, telnet sometimes work and
sometimes fail on both cluster IP and hostname. Unstable.
With Server A online and Server B offline, telnet sometimes work and
sometimes fail on both cluster IP and hostname. Unstable.

The above observations are not normal, are they? Can someone kindly
explain what is happening behind the scenes and what I can do to solve
the problem?

Greatly appreciate all help that I can get!

Regards,
Alwyn


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