Unable to reach IP addresses from LAN to DMZ

I have two servers in my DMZ

My-Server-1 with IP 10.70.100.1
My-Server-2 with IP 10.70.100.2

I am able to ping the two IP addresses above from my Core, Layer-3 switch.

The servers above are also configured in a Load Balance Cluster with the following IP addresses listed below.

My-Server-1 NLBS address 10.70.100.101
My-Server-1 NLBS address 10.70.100.102
Cluster IP address 10.70.100.250

Could someone please provide some assistance in telling me why the cluster addresses listed above are unable to be pinged from my core while they are in the same subnet, and the first addresses listed are pingable?

Thank you
YeloballAsked:
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Craig BeckConnect With a Mentor Commented:
I would look at that issue then - without a MAC address the NLB and cluster IPs are useless.

I would guess that it's a server-side issue, possibly in the NIC or NLB settings somewhere.

What server OS are you using, and how are you load-balancing?
What NICs do you have?  Do they have specific manufacturer configuration software?
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Craig BeckCommented:
Can your core see the MAC address that has been given to the NLB address for each server, and the cluster address' MAC?
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YeloballAuthor Commented:
Craigbeck,

No it cannot see the MAC addresses for each server and the cluster address.
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YeloballAuthor Commented:
Craigbeck,

Should I just add static ARP entry's on the switch for them? I am load-balancing on Server 2008 R2 using Microsoft NLBS.
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MikeNetwork & Systems ManagerCommented:
Have you configured the NLB with the correct operating mode? Windows NLB isn't brilliant.

http://technet.microsoft.com/en-gb/library/cc731616.aspx
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