Hi All, We are experiencing problem with missing packets between Virtual Machines located within the same Virtual Network.
Our setup Contrail 2.20 (buld 64), Priority of encapsulation: VxLAN, MPLSoUDP, MPLSoGRE The effect is visible during each new transmission/flow. There is missing first syn packet or first icmp ping. This affect each tcp session, it's delayed for syn retransmission time. Drops occurs for each subsequent new tcp session between VM's. We can repeat tcp connection between VM and first syn will be missing all the time. It's not visible in all Virtual Networks. There are some other Virtual Networks that works correctly. We can reproduce this behaviour with creating new networks with even only 2 virtual machines. Those networks differs only by other routing-target value. This effect does not appear when we have transmission outside VN (eg through physical gateway) it's only correlated when traffic stays within network. Tcpdump on compute nodes shows that: - All packets are visible on incoming tap interface (from source VM) - all packets are visible on bond interfaces on both compute nodes (vrouter) with VMs (bond active-passive toward physical switch ) Computer nodes are located on the same physical switch (no visible errors on switch ports) - first packet/syn from transmission is missing on a tap interface toward destination VM Please let know if this is some known behaviour. What could be the steps to troubleshoot this issue? Kind Regards Piotr Pieprzycki
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