Hi, all I have added a new packet I have defined a header file, rim.h and rim.cc and I have modified the packet.h and ns-packet.tcl (added PT_RIM, name_[PT_RIM]="RIM", {RIM off_rim_}) and added rim.o to the Makefile. and did make depend; make But I got following error messages. ---------- 'hdr_rim' undeclared 'off_rim_' was not declared .... Can anyone help me? Thank you.