strange dhcp

hi.

In head office i have a cluster. This cluster contains next resources:
1) Print query
2) DHCP service.

NODE1-NODE2-NODE3.
Node 1 and 2 contains resources. Node 1,2 and 3 contains quorum. External
SCSI is absent.
Ok. If one node fail, resources is available.
But that strange. If active node for example NODE1, then this node
distributes ip-adresses for clients. I turn off computer, that run this
node. Cluster mometary switched to NODE2 and now this node distributes
ip-adresses for clients. But clients also have any ip-adresses and dhcp
distributes this, ËÕÙÕËÍÕ× ip-addreses to another clients. And there is
ip-addreses conflict.

Have anybody ideas?

sorry for my english
bye.
Tarakanov Dmitry.