Gianluca, It looks like VM doesn't receive broadcasts. It can be a network topology issue. Could you double check /sys/class/net/bond1/bonding/mode and /sys/class/net/bond1/bonding/slaves ?
Is it possible you have another VM with the same MAC address in the same network segment? On Thu, 2017-01-26 at 00:28 +0100, Gianluca Cecchi wrote: Hello, I'm on 4.0.6 with CentOS 7.3. The hypervisor is an old blade BL685c G1 and the network adapters used to provide network to vm are 07:04.0 Ethernet controller: Broadcom Limited NetXtreme BCM5715S Gigabit Ethernet (rev a3) 07:04.1 Ethernet controller: Broadcom Limited NetXtreme BCM5715S Gigabit Ethernet (re managed by tg3 kernel module, as I see in messages: Jan 21 18:53:33 ovmsrv05 kernel: tg3 0000:07:04.0 eth0: Tigon3 [partno(011276-001) rev 9003] (PCIX:133MHz:64-bit) MAC address 00:1c:c4:46:ef:73 Jan 21 18:53:33 ovmsrv05 kernel: tg3 0000:07:04.0 eth0: attached PHY is 5714 (1000Base-SX Ethernet) (WireSpeed[0], EEE[0]) Jan 21 18:53:33 ovmsrv05 kernel: tg3 0000:07:04.0 eth0: RXcsums[1] LinkChgREG[0] MIirq[0] ASF[0] TSOcap[1] Jan 21 18:53:33 ovmsrv05 kernel: tg3 0000:07:04.0 eth0: dma_rwctrl[76148000] dma_mask[40-bit] Jan 21 18:53:33 ovmsrv05 kernel: tg3 0000:07:04.1 eth1: Tigon3 [partno(011276-001) rev 9003] (PCIX:133MHz:64-bit) MAC address 00:1c:c4:46:ef:74 Jan 21 18:53:33 ovmsrv05 kernel: tg3 0000:07:04.1 eth1: attached PHY is 5714 (1000Base-SX Ethernet) (WireSpeed[0], EEE[0]) Jan 21 18:53:33 ovmsrv05 kernel: tg3 0000:07:04.1 eth1: RXcsums[1] LinkChgREG[0] MIirq[0] ASF[0] TSOcap[1] Jan 21 18:53:33 ovmsrv05 kernel: tg3 0000:07:04.1 eth1: dma_rwctrl[76148000] dma_mask[40-bit] The 2 adapters are in bonding active-backup mode. They are on vlan, so on hypervisor I have bond1.65 device and in vm the virtual interface is untagged [root@ovmsrv05 ~]# ifconfig bond1.65 bond1.65: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 ether 00:1c:c4:46:ef:73 txqueuelen 1000 (Ethernet) RX packets 4368 bytes 257675 (251.6 KiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 238 bytes 28146 (27.4 KiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 [root@ovmsrv05 ~]# Currently Active Slave: enp7s4f0 After a few minutes I loose connectivity with the guest. In this case if I go in guest console and ping the gateway, the connection is resumed. And I can maintain it if I leave the ping running, otherwise after a little I again loose connectivity. I suspect it is not important but the guest is Oracle Linux 6.5 with 3.8.13-16.2.1.el6uek.x86_64 kernel. The adapter for the vnic is the default; the qemu-kvm command line generated contains this: -netdev tap,fd=29,id=hostnet0,vhost=on,vhostfd=30 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=00:1a:4a:16:01:51,bus=pci.0,addr=0x3 I seem to remember some years ago when I used the same blades with plain qemu-kvm/libvirt I had to make up an ethtool setting for similar problems, but I don't remember what it was... and possibly I used bnx2 kernel module with the other embedded network interfaces, I'm not sure... Currently, the configuration for adapter on the blade is [root@ovmsrv05 ~]# ethtool -k enp7s4f0 Features for enp7s4f0: rx-checksumming: on tx-checksumming: on tx-checksum-ipv4: on tx-checksum-ip-generic: off [fixed] tx-checksum-ipv6: off [fixed] tx-checksum-fcoe-crc: off [fixed] tx-checksum-sctp: off [fixed] scatter-gather: on tx-scatter-gather: on tx-scatter-gather-fraglist: off [fixed] tcp-segmentation-offload: off tx-tcp-segmentation: off [requested on] tx-tcp-ecn-segmentation: off [fixed] tx-tcp6-segmentation: off [fixed] udp-fragmentation-offload: off [fixed] generic-segmentation-offload: on generic-receive-offload: on large-receive-offload: off [fixed] rx-vlan-offload: on [fixed] tx-vlan-offload: on [fixed] ntuple-filters: off [fixed] receive-hashing: off [fixed] highdma: on rx-vlan-filter: off [fixed] vlan-challenged: off [fixed] tx-lockless: off [fixed] netns-local: off [fixed] tx-gso-robust: off [fixed] tx-fcoe-segmentation: off [fixed] tx-gre-segmentation: off [fixed] tx-ipip-segmentation: off [fixed] tx-sit-segmentation: off [fixed] tx-udp_tnl-segmentation: off [fixed] tx-mpls-segmentation: off [fixed] fcoe-mtu: off [fixed] tx-nocache-copy: off loopback: off rx-fcs: off [fixed] rx-all: off [fixed] tx-vlan-stag-hw-insert: off [fixed] rx-vlan-stag-hw-parse: off [fixed] rx-vlan-stag-filter: off [fixed] busy-poll: off [fixed] tx-sctp-segmentation: off [fixed] l2-fwd-offload: off [fixed] hw-tc-offload: off [fixed] [root@ovmsrv05 ~]# systool shows no particular parameters for tg3 kernel module available [root@ovmsrv05 ~]# systool -v -m tg3 Module = "tg3" Attributes: coresize = "170653" initsize = "0" initstate = "live" refcnt = "0" rhelversion = "7.3" srcversion = "D276F97F491ADECC61C8284" taint = "" uevent = <store method only> version = "3.137" Sections: ... Thanks, Gianluca _______________________________________________ Users mailing list Users@ovirt.org<mailto:Users@ovirt.org> http://lists.ovirt.org/mailman/listinfo/users
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