2008/7/25 Omprakash Gnawali <[EMAIL PROTECTED]>: > On Wed, Jul 23, 2008 at 11:45 AM, fatima zohra <[EMAIL PROTECTED]> > wrote: > > > > > > 2008/7/23 Omprakash Gnawali [EMAIL PROTECTED]: > > > >> > >> If you put sequence numbers in the packet, you can find out which > >> packets were not received. For example, you sent sequence numbers 1 > >> through 10 but and received 1,2,3,4,6,7,8,9,10 then you know exactly > >> how many packets were not received. > >> > >> - om_p > > > > actually this isn't my scenario; > > here is an example of my protocol mechanism: > > we assume Node1 neighbor of nodes 2 & 3, and these two nodes are > neighbors > > of source S (S will send 10 msgs for example) > > if 3 crashes so node 1 won't receive any more packets from 3. which means > if > > You said there is one source but why is node 3 sending packets?
because node 3 will forward what the source is sending in order to reach the sink (let's say for example sink = node1 to make it easier) > > > > S sends messages (from numSeq = 5 to 9) node A will never notice that he > > Node A is mentioned here for the first time. Is it node A or 1 or 2 or 3? sorry, it's node 1 (which isn't a "direct" neighbor to the source S) > > > > missed the 5 last nodes (because he doesn't communicate with S directly , > > Nodes or packets? sorry again, it's "packets" > > > > and node 3 is turned off for ever and node 2 won't help him to know what > > node 3 lost as messages (from S or other sources) because seq number is > > unique and different for each node (the 5th seqNum for node 2 may be the > 1st > > message of the source S) > > now i wonna to calculate packet loss rate in my network since i have a > set > > of nodes who crash and will lose some sent messages. > > am i clear now ? if yes, how to handle this situation. > > thanks in advance. > > best regards. > > Your description has some typos and could use some clarification. > > - om_p > i mention in addition of what was said that: this simulation is done to study the behavior of the network after some nodes crash. so, first i choose some faulty nodes, then , turn them off for the rest of simulation (they won't receive any packet in the future). in the end of my simulation, i calculate my packet loss rate (i.e number of sent messages but not received by faulty nodes once they are stopped). is it clear now ? Thanks for your help, Best regards
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