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Windows 2008 NLB queries

Posted on 2009-04-06
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Last Modified: 2012-05-06
Hi All,

I had some queries I was hoping someone could help me with;

I have implemented NLB on a two node Windows 2008 cluster. The servers will be used for IIS SMTP only, and I would like traffic to go primarily to Node1, and if that fails - then Node2.

Questions;

i) Should I set the port range to be From: 25 to: 25 only, since the functionality is only SMTP? I assume ping, telnet etc will not be affected?

ii) There is a setting for Filtering Mode (multiple host, single host) and affinity (none, single, network)...could someone expand on what these mean

iii) Can I set up the load balancing so that Node1 is preferred and Node2 is only used if Node1 is down?

Many thanks in advance
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Question by:kam_uk
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mkbean earned 500 total points
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Hi Kam,

Responses to your Questions;

i) Should I set the port range to be From: 25 to: 25 only, since the functionality is only SMTP? I assume ping, telnet etc will not be affected?  

All other services will work they just want be load-balanced amonst the hosts.

ii) There is a setting for Filtering Mode (multiple host, single host) and affinity (none, single, network)...could someone expand on what these mean?

Single affinity: connections initiated by a given ip address are handled by the same server in the cluster until cluster membership changes. This is useful for those applications that maintain sessions across multiple connections (e.g. E-commerce applications). Note that SSL connections will need single affinity to avoid re-negotiation at every attempt.
No affinity: connections are load-balanced based on originating address and port. This is more efficient, as connections from the same client can be routed to several hosts.
VPN and IPSec affinity: vpn and ipsec sessions will be preserved even if cluster membership changes.
Class C affinity: useful when internet clients access the cluster through proxies that expose the same class-C addresses. Load balancing is based on the class-C subnet portion of the incoming address.  

iii) Can I set up the load balancing so that Node1 is preferred and Node2 is only used if Node1 is down?

You could go into the NLBS Admin tool and suspend the 2nd node.  Or you can work with the weights under the port settings.

Brian
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