Routing & Middleware: Experiments Eleonora Borgia, Franca Delmastro, and Luciana Pelusi Pervasive Computing & Networking Lab. (PerLab) IIT-CNR Pisa

Current works and results Ad Hoc Framework (HUT)  OLSR  AODV (waiting for v.0.8) Data transfer application on OLSR FreePastry on OLSR  Distributed Messaging service

Indoor scenario Lifts Offices Technical characteristics:  5 IBM laptops  Wireless cards: D-Link Air DWL-650  Linux kernel Network topology:  5 nodes  Max distance = 3 hops

OLSR open issues... Cost updates?? (non-sense values in some cases) Each node has a kernel route towards itself with cost >= 1  The IP_mainAddress has to be set to one of the active interfaces  There is not check if Originator_Address = IP_mainAddress Too large time values for topology changes notification (more than 60 sec) Correct data collection of topology changes from OLSR Problems with OLSR and CCRS interactions Problems with CCRS and kernel RT interactions

First exp: OLSR – 4 nodes Lifts Offices A, B start at t=0 C start at t=30 s D start at t=60 s B stop at t=90 s Finish time t=150 s A B C D CCRS updating problems:  A has no route towards D (also before B stopping)  D does not realize that B disappears, even at the end.

Second exp: OLSR – 4 nodes Lifts Offices A, B start at t=0 C start at t=30 s D start at t=60 s C stop at t=90 s Finish time t=150 s A B C D

Second exp: problems Lifts Offices A B C D D kernel routing table before C stopping  If D  A is unidirectional, why it’s added to kernel RT??  If it is not, why D doesn’t update B route with the new one with minimum cost??  Only after C stopping, D updates B route with (D - A - B) !  Why D-C-A-B and not D-C-B ??? (D receives C neighbors included B) C-0BC2AC1 A-0

Third exp: 5 nodes Lifts Offices A, B, C start at t=0 D start at t=30 s E start at t=60 s C stop at t=120 s Finish time t=180 s A B C D E CCRS updating problems:  B has no route towards D  D has no route towards E  E has no route towards D

Applications on OLSR Data transfer application between 2 nodes on 3 nodes network  (client-server protocol realized in C)  problems establishing multi-hop.... Application problem  FreePastry Distributed Messaging application realized in Java  First of all we have to resolve our problems with multihop!!!  Then at least 5 nodes providing the service and the routing are needed to analyze middleware multi-hop