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Applied Networking Research Workshop 2020
acm sigcomm
NeST: Network Stack TesterShanthanu S Rai, Narayan G, Dhanasekhar M,
Leslie Monis, Mohit P. Tahiliani
Wireless Information Networking Group (WiNG)Department of Computer Science and Engineering
National Institute of Technology Karnataka, Surathkal, Mangalore, IndiaJuly 30, 2020
1Introduction
Network ExperimentationI Physical testbeds
Network NamespacesI Virtualize network stackI Complex virtual topologies can be createdI Minimal system resources
Existing toolsI MininetI Flexible Network Tester (Flent)I TransperfI NetestoI TEACUP
Applied Networking Research Workshop 2020 |
2NeST: Network Stack Tester
I Python package to simplify the process of network experimentation byusing Linux network namespaces
I Intuitive APIs to: build a virtual network, run experiments and collectstatistics
I Simplifies the process to reproduce network experimentsI Less physical resources, less error prone and less prerequisitesI Multiple instances of the same network topology can co-exist, and
different experiments can be run in parallel on every instanceI Open source tool released under GPLv2 LicenseI Link: https://nitk-nest.github.io/
Applied Networking Research Workshop 2020 |
3API
# Create two nodesn0 = Node('n0')n1 = Node('n1')
# Connect nodes and get corresponding interfaces(n0_n1, n1_n0) = connect(n0, n1)
# Assign addresses to the interfacesn0_n1.set_address('10.0.0.1/24')n1_n0.set_address('10.0.0.2/24')
# Set link propertiesn0_n1.set_attributes('5mbit', '5ms')
# Create an experiment named 'mytest' to run# on the built topologyexp = Experiment('mytest')
# Add 1 flow from n0 to n1 from time t=0s to t=10sexp.add_flow(Flow(n0, n1, n1_n0.get_address(), 0, 10, 1))
# Run the experimentexp.run()
Peer to peer topology
Applied Networking Research Workshop 2020 |
4Architecture
Kernel
API
Engine Module
Invoke iproute2 andnetworking tools
Topology Map
Experiment ModuleTopology Module
2. Request Engine to buildtopology with iproute2
5. Request Engine to runnetworking tools to create
flows and obtain results
3. Store mapping betweenuser given names and NeST’sinternal names
6. Convert NeST’s internal names to user-given nameswhile displaying results.
1. Invoke topology relatedAPI
4. Invoke experiment relatedAPI
# Create two nodes
n0 = Node('n0')
n1 = Node('n1')
# Connect nodes and get corresponding interfaces
(n0_n1, n1_n0) = connect(n0, n1)
# Assign addresses to the interfaces
n0_n1.set_address('10.0.0.1/24')
n1_n0.set_address('10.0.0.2/24')
# Set link properties
n0_n1.set_attributes('5mbit', '5ms')
# Create an experiment named 'mytest' to run
# on the built topology
exp = Experiment('mytest')
# Add 1 flow from n0 to n1 from time t=0s to t=10s
exp.add_flow(Flow(n0, n1, n1_n0.get_address(), 0, 10, 1))
# Run the experiment
exp.run()
Peer to peer topology
Applied Networking Research Workshop 2020 |
5Scope and Limitations
ScopeI Advanced traffic controlI TCP parametersI Netperf, ss, tcI Addition of new tools is easy (e.g., httperf)
LimitationsI Effects of hardware level optimizations are not seenI Lack of support for all implementations of network stacksI Lack of advanced debugging functions
Applied Networking Research Workshop 2020 |
6Experiment 1
MotivationHow accurate are NeST results compared to a physical testbed?
Figure: Simple topology for NeST Validation
I 4 CUBIC TCP flows from Node0 to Node1I Two experiments run with two different qdiscs at Router: CoDel and
FIFO.
Applied Networking Research Workshop 2020 |
7Experiment 1: Plots
CoDel
0
20
40
60
80
100
120
140
0 10 20 30 40 50 60
cwnd (
segm
ents
)
Time (s)
Flow 1 Flow 2 Flow 3 Flow 4
(a) cwnd: NeST
0
20
40
60
80
100
120
140
0 10 20 30 40 50 60
cwnd (
segm
ents
)
Time (s)
Flow 1 Flow 2 Flow 3 Flow 4
(b) cwnd: Physical Testbed
FIFO
0
50
100
150
200
250
300
350
400
450
0 10 20 30 40 50 60
cwnd (
segm
ents
)
Time (s)
Flow 1 Flow 2 Flow 3 Flow 4
(a) cwnd: NeST
0
50
100
150
200
250
300
350
400
450
0 10 20 30 40 50 60
cwnd (
segm
ents
)
Time (s)
Flow 1 Flow 2 Flow 3 Flow 4
(b) cwnd: Physical Testbed
Applied Networking Research Workshop 2020 |
7Experiment 1: Plots
CoDel
0
10
20
30
40
50
60
0 10 20 30 40 50 60
Thro
ughput
(Mbit
/s)
Time (s)
Flow 1 Flow 2 Flow 3 Flow 4
(a) Throughput: NeST
0
10
20
30
40
50
60
0 10 20 30 40 50 60
Thro
ughput
(Mbit
/s)
Time (s)
Flow 1 Flow 2 Flow 3 Flow 4
(b) Throughput: Physical Testbed
FIFO
0
10
20
30
40
50
60
70
80
0 10 20 30 40 50 60
Thro
ughput
(Mbit
/s)
Time (s)
Flow 1 Flow 2 Flow 3 Flow 4
(a) Throughput: NeST
0
10
20
30
40
50
60
70
80
0 10 20 30 40 50 60
Thro
ughput
(Mbit
/s)
Time (s)
Flow 1 Flow 2 Flow 3 Flow 4
(b) Throughput: Physical Testbed
Applied Networking Research Workshop 2020 |
7Experiment 1: Plots
CoDel
0
20
40
60
80
100
120
0 10 20 30 40 50 60
Lin
k U
tilizati
on (
Mbit
/s)
Time (s)
Physical Testbed
NeST
(a) Link Utilization
0
20
40
60
80
100
0 10 20 30 40 50 60
Queue B
acklo
g (
Packets
)
Time (s)
Physical Testbed
NeST
(b) Queue Backlog
FIFO
0
20
40
60
80
100
120
0 10 20 30 40 50 60
Lin
k U
tilizati
on (
Mbit
/s)
Time (s)
Physical Testbed
NeST
(a) Link Utilization
0
200
400
600
800
1000
1200
1400
0 10 20 30 40 50 60Queue B
acklo
g (
Packets
)
Time (s)
Physical Testbed
NeST
(b) Queue Backlog
Applied Networking Research Workshop 2020 |
8Experiment 2
MotivationHow does NeST perform in emulating and running experiments on a fairlycomplex topology?
Figure: Complex topology for NeST validation
Applied Networking Research Workshop 2020 |
9Experiment 2: Plots
0
10
20
30
40
0 20 40 60 80 100 120
cwnd (
segm
ents
)
Time (s)
A(3)
Flow: 1Flow: 2Flow: 3
(a) cwnd: NeST
0
10
20
30
40
0 20 40 60 80 100 120
cwnd (
segm
ents
)
Time (s)
A(3)
Flow: 1Flow: 2Flow: 3
(b) cwnd: Flent
0
10
20
30
40
0 20 40 60 80 100 120Thro
ughput
(Mbit
/s)Time (s)
A(3)
Flow: 1Flow: 2Flow: 3
(a) Throughput: NeST
0
10
20
30
40
0 20 40 60 80 100 120
Thro
ughput
(Mbit
/s)
Time (s)
A(3)
Flow: 1Flow: 2Flow: 3
(b) Throughput: Flent
0
10
20
30
40
0 20 40 60 80 100 120
Round-T
rip T
ime (
ms)
Time (s)
A(3)
Flow: 1Flow: 2Flow: 3
(a) RTT: NeST
0
10
20
30
40
0 20 40 60 80 100 120
Round-T
rip T
ime (
ms)
Time (s)
A(3)
Flow: 1Flow: 2Flow: 3
(b) RTT: Flent
Applied Networking Research Workshop 2020 |
9Experiment 2: Plots
0
20
40
60
80
100
0 20 40 60 80 100 120
Lin
k U
tilizati
on (
Mbit
/s)
Time (s)
Router0
FlentNeST
(a) Link Utilization: Router0
0
50
100
150
200
0 20 40 60 80 100 120
Lin
k U
tilizati
on (
Mbit
/s)
Time (s)
Router1
FlentNeST
(b) Link Utilization: Router1
0
50
100
150
200
0 20 40 60 80 100 120
Lin
k U
tilizati
on (
Mbit
/s)
Time (s)
Router3
FlentNeST
(c) Link Utilization: Router3
To view other plots, please check: https://gitlab.com/nitk-nest/nest-anrw20
Applied Networking Research Workshop 2020 |
10Epilogue
I NeST can be obtained from PyPI (Python Package Index)I NeST is open source software. Contributions are welcome.I Website: https://nitk-nest.github.io/
Contact us:Shanthanu S [email protected]
Narayan [email protected]
Dhanasekhar [email protected]
Leslie [email protected]
Mohit P. Tahilianitahiliani
@nitk.edu.in
Applied Networking Research Workshop 2020 |
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