I didn't get the significance of lamp test packet .
I read about this from "TCP/IP illustarted Vol-1 By W. Rechard Stevens"

it says a segment with the maximum combination of
allowable flag bits turned on at once( SYN, URG, PSH, FIN, and 1 byte
of data)
called a Kamikaze packet also known as nastygram , christmass tree
or lamp test packet