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DSR's routing overheads



After simulating the DSR protocol with 50 nodes for 900 seconds for different scenarios,
I discovered that there are a lot of routing overheads. For example, when I used a scenario
of 1500x300 with 0 pause time and together with a connection file of 10 sources, I get a total
of  over 110, 000 routing overhead packets! This is in great contrast to the 13,000 packets
in CMU's performance comparison test. The way I calculated the overhead is by counting
the number of DSR routing packets transmitted and forwarded.
Another strange thing is that I noticed a lot of packets dropped due to strange reasons. An
example is a line in the output trace file:
 
D 71.748561683 _17_ IFQ  --- 1848 cbr 96 [0 2e 11 800] ------- [17:0 18:0 32 46]  [237] 0 2
The reason for the drop is "---" ???
 
Can anyone help me on these two problems? Thank you.