Dear list, We experience the following behaviour. After a while, this can be serveral months, networking for a Virtual Machine (qemu / kvm on Ubuntu Trusty, openvswitch 2.0.2-0ubuntu0.14.04.2) stops working (correctly). At that point several TB of traffic has passed through the virtual network interface. How do we know networking stops working? The VM is unable to do any network related work. If we reboot this VM it is unable to receive a DHCP lease. We see the arp requests (ipxe) making it out of the virtual network. Four in total but only one of them makes it onto the bridge / physical network interface (confirmed with tcpdump).
- ovs-ofctl dump-ports bridge output for this vnet gives a very high drop counter "drop=1795999" which is continuously increasing while the ipxe bootrom is in a state "Booting from Hard Disk..." - ovs-appctl dpif/dump-flows bridge doesn't give an active datapath flow for this interface - ovs-appctl ofproto/trace bridge in_port=port-nr dl_src=mac-address,dl_dst=ff:ff:ff:ff:ff:ff gives "Datapath actions: push_vlan(vid=139,pcp=0),10,12,pop_vlan,43" So the openflow rules that are in affect allow the DHCP request. OpenFlow rules active for this interface: ovs-ofctl dump-flows uplink |grep in_port=17 cookie=0x0, duration=5549854.234s, table=0, n_packets=8665537966, n_bytes=2785309429237, idle_age=1022, hard_age=65534, priority=40000,in_port=17,dl_src=mac-address actions=NORMAL cookie=0x0, duration=5549854.217s, table=0, n_packets=0, n_bytes=0, idle_age=65534, hard_age=65534, priority=39000,in_port=17 actions=drop If we poweroff / poweron this VM, networking starts working again (reboot of VM does not help). The other ~ 30 VMs on the same hypervisor (configured in the same way) just work. We have seen this happening to a VM for the third time now. So for some reason packets seem to dropped by OpenvSwitch. How should I continue to debug this issue? Any help is appreciated. Thanks, Stefan Kooman -- | BIT BV http://www.bit.nl/ Kamer van Koophandel 09090351 | GPG: 0xD14839C6 +31 318 648 688 / [email protected] _______________________________________________ discuss mailing list [email protected] http://openvswitch.org/mailman/listinfo/discuss
