I've designed a routing protocol that works over 802.11 in NS2. I have used a standard CBR source attached to a UDP agent to simulate traffic in the network. I find that when I change the CBR packet-size to 1500 from 1000, the number of packets in the system doubles for the same data rate; so there is fragmentation happening somewhere in the lower layers. However, I'm unable to find the code segment that handles this fragmentation in any of the C++ modules. I know that mac-802_3.h defines an IEEE_8023_MAXFRAME, but I don't see an MTU defined in mac-802_11.h or mac.h. So I'm curious as to how and where the data packets actually get fragmented. Is it implemented in mac itself, or in the link/physical layers? If someone could point me in the right direction, that would be great.
Thanks in advance, Dhrubo. -- Dhrubojyoti Roy PhD Student (2nd year) Department of Computer Science and Engineering, The Ohio State University, 2015 Neil Avenue, Columbus, OH-43210. +1-740-417-5890
