Hi, I use allinone-2.1b8a. I want to create a new protocol. Therefore, I need to modify tcl/lib/ns-packet.tcl. However, I can not find such file in my ns. In my ns-allinone-2.1b8a directory, there are lib, tcl8.3.2, and tclcl-1.0b11 subdirectories, etc. In tcl8.3.2, there is a library directory. However, I can not find the ns-packet.tcl file. Could anyone help me? Charles