How to run

  make ping

This will run the augmented tool and append the ttest output in the ttest_output.txt file.

If you want to clear the ttest_output.txt file, run the following command

  make clean

And then run the make ping command again.

Setup

+---------------------+              +------------------------+                +---------+
|         LAN         |              | Raspberry Pi Router    |                |  Client |
|---------------------|              |------------------------|                |---------|
|                     |----(eth0)----|                        |----(br-lan)----|         |
|                     |              |------------------------|                |         |
|                     |              |        (br-lan)        |                |         |
|                     |              +------------------------+                |         |
|                     |                                                        |         |
+---------------------+                                                        +---------+

How to change the upload rate

  tc qdisc add dev eth0 root netem rate 30mbit

How to change the download rate

To shape the download traffic, we add a virtual interface (ifb0) to capture and redirect incoming traffic from the physical network interface . Effectively, we capture incoming traffic on the virtual interface, shape it according to requirement and redirect it into the physical interface.

  ip link add name ifb0 type ifb
  ip link set dev ifb0 up
  tc qdisc add dev eth0 handle ffff: ingress
  tc filter add dev eth0 parent ffff: protocol ip u32 match u32 0 0 action mirred egress redirect dev ifb0
  tc qdisc replace dev ifb0 root handle 1: htb default 1
  tc class add dev ifb0 parent 1: classid 1:1 htb rate 100mbit

Setup (with virtual interface)

+---------------------+                    +------------------------+                +---------+
|         LAN         |                    | Raspberry Pi Router    |                |  Client |
|---------------------|                    |------------------------|                |---------|
|                     |---(ifb0)-(eth0)----|                        |----(br-lan)----|         |
|                     |                    |------------------------|                |         |
|                     |                    |        (br-lan)        |                |         |
|                     |                    +------------------------+                |         |
|                     |                                                              |         |
+---------------------+                                                              +---------+

References

https://dl.acm.org/doi/pdf/10.1145/3230543.3230549 https://www.mdpi.com/1424-8220/23/2/923 https://www.researchgate.net/publication/354194462_Measuring_and_Localising_Congestion_in_Mobile_Broadband_Networks