Hi Admins,
Thanks for your valuable reply.
Well, I manage to renaming the file a (step 19). Finally the service is working fine with both the servers. Now the final problem is if 1st server is down, 2nd is getting up but clients machines are not getting the ip addresses.
I added the 2nd server ip in Router already, but still clients are not getting the ip.
In step 21 is written "add a DHCP relay address to the second server", please can anyone tell me it asking for which address?
Thanks in advance.