Microsoft NLB Issue

I am working on two different networks. One of them has two computer where microsoft NLB is configured. The situation is like tha attached picture.
When I ping the NLB IP ( from network 2, I get response. But when I ping from network 1, I do not get any response.

Does someone have an explanation for this ?
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It would help if you posted the picture as a JPG or BMP instead of a Visio drawing...
beke_josueAuthor Commented:
Here is the picture in jpg format
If you are using multicast you also have to configure the routers.

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Windows Server 2003

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