Spis treści
Linux: TC - bandwidth limitation, transmission error induction and delays
programmes used to take measurements:
Connection diagram
Diagram generated using my script
| Machine name | Network card | ip address | gateway | Virtual switch |
|---|---|---|---|---|
| ubuntu-tc | eth0 | 192.168.1.1/24 | X | NET-A |
| eth1 | 192.168.2.1/24 | X | NET-B | |
| ubuntu-tc-A | eth0 | 192.168.1.10/24 | 192.168.1.1/24 | NET-A |
| ubuntu-tc-B | eth0 | 192.168.2.10/24 | 192.168.2.1/24 | NET-B |
Settings on the "Ubuntu-tc" machine
- enable forwarding for ipv4
echo "net.ipv4.ip_forward=1" | sudo tee -a /etc/sysctl.conf
- restart the network interfaces
- copy tc-gui to machine and run
sudo apt install git git clone https://github.com/tum-lkn/tcgui cd tcgui sudo python3 main.py --ip 127.0.0.1
- open firefox browser to address
127.0.0.1:5000
Settings on the rest of the machines
sudo apt-get update sudo apt-get install iperf3
We still need to address them statically via the GUI or by using netplan
Test results table
| Test description | protocol | loss | bandwidth | delay [ms] |
|---|---|---|---|---|
| Delay tests | ||||
| Test without added delay | icmp | 0% | — | 1,131 |
| Test with added 10ms delay result from 100 measurements | icmp | 0% | — | 11,020 |
| test with added 100ms delay result from 100 measurements | icmp | 0% | — | 101,071 |
| test with added 1000ms delay result from 100 measurements | icmp | 0% | — | 1000,911 |
| UDP bandwidth tests | protocol | Lost/Sent | bandwidth | delay [ms] |
| Unlimited 30s test (UDP 1Gbps iperf) | UDP | — | 998 Mbps | — |
| 300Mbps 30s bandwidth limitation (UDP iperf) | UDP | 72% | 282 Mbps | — |
| Bandwidth limitation to 100Mbps 30s (UDP iperf) | UDP | 91% | 94.3 Mbps | — |
| 10Mbps 30s bandwidth limitation (UDP iperf) | UDP | 99% | 9.72 Mbps | — |
| Bandwidth limitation to 1Mbps 30s (UDP iperf) | UDP | 1e+02% | 972 kbps | — |
| TCP bandwidth tests | protocol | retransmissions | bandwidth | delay [ms] |
| Unlimited 30s test (TCP iperf) | TCP | 2 | 10.3 Gbps | — |
| Bandwidth limitation to 300Mbps 30s (TCP iperf) | TCP | 0 | 282 Mbps | — |
| Bandwidth limitation to 100Mbps 30s (TCP iperf) | TCP | 0 | 94.3 Mbps | — |
| Bandwidth limitation to 10Mbps 30s (TCP iperf) | TCP | 152 | 9.72 Mbps | — |
| Bandwidth limitation to 1Mbps 30s (TCP iperf) | TCP | 0 | 972 kbps | — |
| Other Tests | ||||
| Round trip link test 10Mbps, latency 2000ms, urata 3%, corrupted 10% (ping 100 measurements) | ICMP | 24% | — | 4001,69 |
| 10Mbps round trip link test, latency 600ms, loss 3%, corrupted 10% (TCP iperf) | TCP | 23 | 82 kbps | — |
| 10Mbps round trip link test, latency 600ms, loss 3%, faulty 10% (UDP iperf) | UDP | 99% | 7.79 kbps | — |
| 60Mbps round trip link test, 600ms latency, 5% loss (UDP iperf) | UDP | 98% | 14.7 Mbps | — |
Delay tests
Test without added delay
Test with added delay 10ms result from 100 measurements
test with an added delay of 100ms result from 100 measurements
test with an added delay of 1000ms result from 100 measurements
test with added delay of 5000ms result from 100 measurements
Bandwidth limitation test
Unlimited 30s test (UDP 1Gbps iperf)
Bandwidth limited to 300Mbps 30s (UDP iperf)
Bandwidth limitation to 100Mbps 30s (UDP iperf)
Bandwidth limitation to 10Mbps 30s (UDP iperf)
Bandwidth limitation to 1Mbps 30s (UDP iperf)
Unlimited test 30s (TCP iperf)
Bandwidth restriction up to 300Mbps 30s (TCP iperf)
Bandwidth limitation to 100Mbps 30s (TCP iperf)
Bandwidth limitation to 10Mbps 30s (TCP iperf)
Bandwidth limitation to 1Mbps 30s (TCP iperf)
Round trip link test 10Mbps, latency 2000ms, urata 3%, faulty 10% (ping 100 measurements)
10Mbps round trip link test, latency 600ms, loss 3%, corrupted 10% (TCP iperf)
10Mbps round trip link test, 600ms latency, 3% loss, 10% corrupted (UDP iperf)
60Mbps round trip link test, 600ms latency, 5% loss (UDP iperf)
