Public bug reported:

Ubuntu release: Ubuntu 20.04 (Ubuntu 20.04.3 LTS)
Package version: 5.10.0

After setting the same mac address on enp4s0 as enp3s0, I set up the prp
link with the command

ip link add name prp0 type hsr slave1 enp3s0 slave2 enp4s0 version 1
proto 1

I made a simple udp client that sends packets every 10 ms containing an
int that increments for each packet. The udp client was running on
computer 1.

I made a simple udp server that receives the packets and prints the
containing int. The udp server was running on computer 2.

The computers were connected directly to each other with two network
cables.

The expected result was that the udp server would not receive any
duplicates.

What happened was that the first 1821 packets were ok. After that 55% of
the packets were duplicates.'

After a reboot, the first packets were ok, but again, duplicates started
appearing after some time.

I got more or less the same results with version 0 of prp.

** Affects: iproute2 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1942450

Title:
  Receiving duplicate packets on prp link

Status in iproute2 package in Ubuntu:
  New

Bug description:
  Ubuntu release: Ubuntu 20.04 (Ubuntu 20.04.3 LTS)
  Package version: 5.10.0

  After setting the same mac address on enp4s0 as enp3s0, I set up the
  prp link with the command

  ip link add name prp0 type hsr slave1 enp3s0 slave2 enp4s0 version 1
  proto 1

  I made a simple udp client that sends packets every 10 ms containing
  an int that increments for each packet. The udp client was running on
  computer 1.

  I made a simple udp server that receives the packets and prints the
  containing int. The udp server was running on computer 2.

  The computers were connected directly to each other with two network
  cables.

  The expected result was that the udp server would not receive any
  duplicates.

  What happened was that the first 1821 packets were ok. After that 55%
  of the packets were duplicates.'

  After a reboot, the first packets were ok, but again, duplicates
  started appearing after some time.

  I got more or less the same results with version 0 of prp.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/iproute2/+bug/1942450/+subscriptions


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