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NLB issue

Posted on 2009-04-14
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Last Modified: 2012-05-06
We have two nodes on NLB, pub ip is 203.38.180.208 and 209. The cluster IP is 203.38.180.219. The management (local) IPs are 10.0.12.41 and 42 respectively.

When I connect to the NLB, i get the error "Host unreachable, error connecting to "uwc-web2", which is 10.0.12.42. When I try to ping this IP from 10.0.12.41, i get timed out error messages. Is this normal or should they be able to ping each other?

How can I confirm if NLB is doing load balancing?
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Question by:Network_Padawan
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by:lnkevin
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....Is this normal or should they be able to ping each other?
You should be able to ping from one to other with the management IP or DNS name if DNS is set up. If not, try to ping the 10.0.12.42 and vice versa

If your host don't see each other, some thing goes wrong with the switch and connections. You can try to open Network Load balancing manager, right click on the cluster --> Control Hosts --> Stop then Start.

How can I confirm if NLB is doing load balancing?
On the two nodes, open performance manager and add network performance manager for the NICs that host 203.38.180...

From a client in the network, open command line and type:
ping 203.38.180.219 -L 10000

Analyze the performance monitor, you will see the load will be splited to the two nodes, each carries 5000

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by:Network_Padawan
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Thanks Inkevin, ill check that out
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by:Network_Padawan
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Okay, the switchports were incorrectly set. I can now ping both server from the management IPS,

10.0.12.41 and .42 and visa versa.

On the server 203.38.180.209, it sees both nodes successfully.

On the other server, 203.38.180.208, no luck. Still says it can not see the other node. Restarted...no luck. It can ping both IP and hostname.

What else can I try?
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by:Network_Padawan
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"On the two nodes, open performance manager and add network performance manager for the NICs that host 203.38.180..."

Did you mean performance monitor??? How do I access performance manager?
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by:lnkevin
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Performance Monitor, I meant.

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by:lnkevin
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On the other server, 203.38.180.208, no luck. Still says it can not see the other node...

Since you can ping it, what do you mean cannot see...?
Can you open NLB Manager on .208? If you can open NLB, try to add other node. It rarely sees other node by default. You must add it on NLB every time. If you have 3 or 4 nodes, you just need to add one node and others will show up automatically. It's a bug from MS.

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by:Network_Padawan
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Hi Inkevin,

Therein lies my issue. I can ping it from both ends no problem. on the .209, i can successfully add the other node.

On .208, it says it can not find the other node. Its wierd.

Im thinking about rebooting the server completely and see if that does the trick, cause the stop and start commands do not help.
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lnkevin earned 500 total points
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After reboot your servers, on the .208 when you successfully added the other node, right click on the cluster node look in the options for Control hosts and stop then start. Make sure you always reboot one physical add a time and wait until it comes up successfully before reboot the other. If you have to schedule an automatic reboot, make sure they are 15 minutes apart. You still have to stop and start the nodes in NBL clustering manager to ensure all nodes are available. I have learned a great experience from doing this.

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by:Network_Padawan
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Thanks Inkevin Ill do that and post back what happened
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