Public bug reported:
Enabling linux bridging, via netplan, whilst using an OSA card on the
s390x architecture causes large amounts of packets to be received on the
sending interface. This behaviour is not seen while using other types of
network card on a Z, and is also not seen on any other server
architecture (x86 / ppc64).
When performing a ping test, the following can be seen:
- Pings that are unsuccessful (Around 60% of packets sent) are not received by
the network switches
- These unsuccessful pings will trigger the following message in a dmesg
output: "received packet on vlan2011 with own address as source address"
- tcpdump will also display the packet twice, confirming the dmesg output.
The behaviour is not seen during connections to other addresses on the same
VLAN.
Successful pings occur directly after an ARP request is made, however
permanently setting the ARP entry results in 100% of packets failing to send
We are using Ubuntu 22.04.4 LTS.
I've attached a zipped folder containing the outputs of the dmesg and
tcpdumps - As well as the outputs of a dbginfo command
** Affects: ubuntu
Importance: Undecided
Status: New
** Attachment added: "CmdOutputs.zip"
https://bugs.launchpad.net/bugs/2060939/+attachment/5763700/+files/CmdOutputs.zip
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https://bugs.launchpad.net/bugs/2060939
Title:
s390x OSA bridging causes network issues
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