MayurPatel,
Also check out this thread:
http://www.vmware.com/community/thread.jspa?forumID=21&threadID=16138
There's a guy that says he can do the kickstart file over NFS, but not over http.
Also, a more detailed document about the Altiris solution:
http://www.managefusion.com/upload/deploying_vmware__esx_server_2_5.doc
Turns out that Altiris creates a 2Gb partition on de Harddrive, copies its file there, boots from that partition and uses loadlin from there...
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thedude_