PXE-E53: No boot filename received

hi,

    I am new to OSD feature of SCCM 2012 SP1.

    I have a setup of POC and getting below error on pxe boot.

    PXE-E53: No boot filename received

    I have SCCM primary server, pxe enabled DP-MP and DHCP manager on same physical machine.

    Clients and Server are in same subnet.

    Also AD server is configured on another physical machine.

Please suggest.

Thanks in advance.