NLB cluster slow incoming transfer speed

I have an NLB cluster. There are two nodes in it - nlbtest1.local (192.168.0.231)  and nlbtest2.local (192.168.0.232) . Cluster domain name is nlbtest, ip 192.168.0.233. Cluster is functioning in mulicast mode. Using Windows explorer I go to \\nlbtest and when I try to upload some file to this resourse speed is 20 KB/s. Download speed is 10 MB/s . When I go to \\nlbtest1 or \\nlbtest2 upload and download speed is ok - about 10 MB/s. What can be the problem?
roma_vtAsked:
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kevinhsiehCommented:
NLB isn't designed for file sharing. File servers should be clustered using failover clustering. That might be part of the issue. What services are you hoping to have on this cluster?
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roma_vtAuthor Commented:
SMTP server. And when I tried Exchange Hub transport with CAS array on it situation was the same. Sending mail speed was 20 Kbit/s.
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kevinhsiehCommented:
Have you tried using unicast?

For multicast operation, did you create static arp and cam entries? Unicast is simpler because you don't need to perform special configuration on the network equipment, but you do need 2 NICs per NLB node.
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roma_vtAuthor Commented:
Thanks, I'll try to use unicast on hardware. But when I tried to use unicast in Hyper-V - it didn't help.

And about multicast. What static arp and cam entries should I create and where? On switch, to which NLB servers are connected?
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roma_vtConnect With a Mentor Author Commented:
I used HUB to connect both servers and it resolved my problem=))
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roma_vtAuthor Commented:
on cisco.com they adviced to use HUB =)
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