11.1.1 Adding a New Packet Header Type

Assuming we wish to create a new header called newhdr the following steps are performed:

1.

sep0pt

2.

create a new structure defining the raw fields (called hdr_newhdr), define offset_ and access methods.

3.

define member functions for needed fields.

4.

create a static class to perform OTcl linkage (defines PacketHeader/Newhdr), do bind_offset() in its constructor.

5.

edit tcl/lib/ns-packet.tcl to enable new packet format (see 11.2.2, 11.2.4). Alternatively, one may call create-packet-header in one's own code (see tcl/lib/ns-packet.tcl for example of using this Tcl function.