NLB群集下WCF有关问题

NLB群集下WCF问题
想用NLB实现故障转移，架构图如下：

如果改成下面直接访问就能成功，请问该如何解决？
            <endpoint address="net.tcp://192.168.2.178:9208/ClinicBook/Service.svc/BookManage"
                binding="netTcpBinding" bindingConfiguration="NetTcpBinding_ClinicBook_IBookManage"
                contract="ClinicBookService.ClinicBook_IBookManage" name="NetTcpBinding_ClinicBook_IBookManage" />
            <endpoint address="net.tcp://192.168.2.178:9208/ClinicBook/Service.svc/BookNet"
                binding="netTcpBinding" bindingConfiguration="NetTcpBinding_ClinicBook_IBookNet"
                contract="ClinicBookService.ClinicBook_IBookNet" name="NetTcpBinding_ClinicBook_IBookNet" />


                                                  wcf?nlb                                              
[解决办法]
看这篇文章，应该不难啊：
WCF Load Balancing : An End To End Example For NetTcpBinding
http://charliedigital.com/2009/04/17/wcf-load-balancing-an-end-to-end-example-for-nettcpbinding/