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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2060939 Title: s390x OSA bridging causes network issues To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/2060939/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs