Hi Gokul Bhat, Here is the answer to your question:
"s" and "r" indicates that you send and receive the packets respectively. RTR means network layer and AGT means application layer. Here is the full description of trace format: To find the interpretation of all possible trace format when you do the wireless simulation, you'd better read the code of ns2 in file *ns2home/ trace/cmu-trace{.h, .cc}* Mostly, the format would be as ACTION: [s|r|D]: s -- sent, r -- received, D -- dropped WHEN: the time when the action happened WHERE: the node where the action happened LAYER: AGT -- application, RTR -- routing, LL -- link layer (ARP is done here) IFQ -- outgoing packet queue (between link and mac layer) MAC -- mac, PHY -- physical flags: SEQNO: the sequence number of the packet TYPE: the packet type cbr -- CBR data stream packet DSR -- DSR routing packet (control packet generated by routing) RTS -- RTS packet generated by MAC 802.11 ARP -- link layer ARP packet SIZE: the size of packet at current layer, when packet goes down, size increases, goes up size decreases [a b c d]: a -- the packet duration in mac layer header b -- the mac address of destination c -- the mac address of source d -- the mac type of the packet body flags: [......]: [ source node ip : port_number destination node ip (-1 means broadcast) : port_number ip header ttl ip of next hop (0 means node 0 or broadcast) ] Regards Mubashir Husain Rehmani 2009/6/29 gokul bhat <gb...@ufl.edu> > Hello everyone > > I am new to NS2 and also I have very little experience in C/C++ > programming. > Although, I am catching up on the C++ stuff, I am unable to understand the > nam file generated after running any 802.11 MAC simulation in ns2. I am not > able to figure out why most of the control packets are broadcast that is > their destination id is -1. I will paste a part of the nam file generated > i.e. the part I am finding hard to understand. > > r -t 35.225473806 -s 2 -d -1 -p ACK -e 38 -c 2 -a 0 -i 0 -k MAC > + -t 35.225823139 -s 3 -d -1 -p RTS -e 44 -c 2 -a 0 -i 0 -k MAC > - -t 35.225823139 -s 3 -d -1 -p RTS -e 44 -c 2 -a 0 -i 0 -k MAC > h -t 35.225823139 -s 3 -d -1 -p RTS -e 44 -c 2 -a 0 -i 0 -k MAC > r -t 35.226175805 -s 4 -d -1 -p RTS -e 44 -c 2 -a 0 -i 0 -k MAC > + -t 35.226185805 -s 4 -d -1 -p CTS -e 38 -c 2 -a 0 -i 0 -k MAC > - -t 35.226185805 -s 4 -d -1 -p CTS -e 38 -c 2 -a 0 -i 0 -k MAC > h -t 35.226185805 -s 4 -d -1 -p CTS -e 38 -c 2 -a 0 -i 0 -k MAC > r -t 35.226490472 -s 3 -d -1 -p CTS -e 38 -c 2 -a 0 -i 0 -k MAC > > The code I am running is trying to simulate 16 stationary nodes and is > using > CBR traffic. Please help me > > -- > Gokul S Bhat > Graduate Student, Electrical Engineering department, University of Florida, > Gainesville > -- Mubashir Husain Rehmani