DYMO

[Mohsen Sichani]

Hi guys

I was wondering if anybody could answer my question.

Imagine that the client has received a RREP, and has sent a data request to the server, but after a few milisecond, or ... it receives a newer and better RREP, What does actually the client do in this situation?

Regards

Mohsen

[Alfonso Ariza Quintana]

The protocol select the best

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[Mohsen Sichani]

Hi dear Alfonso

I greatly admire your thoughtfulness, I think I was not able to ask my question clearly.

Please consider the following scenario.

            B          C               

A                                       D

                  E

A broadcasts a RREQ for D. Only B and E will receive that. D receives it first via C. (A->B->C->D), because D has not received any other RREQ, it will reply by a RREP (D has not received it from E due a temporary congestion). This RREP will travel back to A (D->C->B->A). In this time A sends a data request to D by broadcasting it. Because B has set a pointer to D and A, it will forward it to C and C sends it to D.

At this time,  D receives the RREQ which was sent by A earlier via E (same Sequence Number) with a better metric. I guess D will discard this RREQ because it has replied to the same sequence number earlier. 

If I consider this scenario correct,  another question arises in my mind. How much D will wait before replying to the first RREQ that it has received, because it may receive another RREQ from another path with better metric later (maybe some milliseconds later).

I greatly appreciate your support.

Thanks a million

Mohsen

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[Alfonso Ariza Quintana]

The node check that the seq number and the number of hops, the actions are:

 

if the seq number is newer the node answer.

If the seq number is the same and the number of hops is lower the node answer

In other case discard

[Mohsen Sichani]

Hi dear Alfonso

I think I got the answer.

I appreciate that and once again

Thanks a million
Cheers
Mohsen