RARP dosent responding - Disk Less clients

Hello all,

Disk less client setup was successfull in RedHat Linux 6.2.
7.2 dosen't have rarp. While the diskless client boots, rarp request for 
IP is sent, but server dosent reply. Previously in 6.2 "rarp -a" and "rarp
-f" commands were used to list and add the entries from /etc/ethers. How
to go about it in 7.2?

Thanks in advance
Johnson.