when i use the VII part, named A new protocol for ns,since i'm new user of ns, i don't know where is the packet.h mentioned in VII.3 Necessary changes, so i can't do some necessary changes, and i don't know where to put the ping.h and ping.cc, because i want my own-defined code ping.h and ping.cc be maked (complied) with other ns source code like packet.h etc. in the same time. By the way, i looked up for all these carefully, but they are not mentioned in the part of tutorial.
