Transcript Middleware and routing experiments

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

Technical
characteristics:

Lifts

Up

Offices

5 IBM laptops
Wireless cards:
D-Link Air DWL-650
Linux kernel 2.6.3
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
D

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

CCRS updating problems:



C
Lifts

Up
Offices
A
B


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
D


C
Lifts


Up

A
B
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
Second exp: problems
D kernel routing
table before C
stopping
D
C
Lifts
-
0
A
C
1
B
C
2
A
-
0
 Why D-C-A-B and not D-C-B ???
(D receives C neighbors included B)
Up
A
C
B
Offices
 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) !
Third exp: 5 nodes

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

CCRS updating problems:

D



C
Lifts
Up
A
B
Offices


E

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