2008/7/25 Omprakash Gnawali <[EMAIL PROTECTED]>: > On Fri, Jul 25, 2008 at 7:37 AM, fatima zohra <[EMAIL PROTECTED]> > wrote: > > > > > > 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 ? > > Almost. > > So you have a topology that looks like this: S --> 3 --> 1 but 3 is > turned off so 1 is not receiving any packets but you want to find the > loss rate on the link 3-->1? > > - om_p >
that's it, but S-->3-->1 is just a piece of my topology (i just noticed it to clarify , my topology is larger than that). let's work with this small scenario. what's the way to find the packet loss rate ?
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