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<div><span style="color: rgb(0, 0, 0);">Gianluca,</span></div>
<div><span style="color: rgb(0, 0, 0);"><br>
</span></div>
<div>It looks like VM doesn't receive broadcasts. It can be a network topology issue.</div>
<div>Could you double check /sys/class/net/bond1/bonding/mode and /sys/class/net/bond1/bonding/slaves ?</div>
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<div>Is it possible you have another VM with the same MAC address in the same network segment?</div>
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</div>
<div>On Thu, 2017-01-26 at 00:28 +0100, Gianluca Cecchi wrote:</div>
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<div>Hello,<br>
</div>
I'm on 4.0.6 with CentOS 7.3.<br>
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The hypervisor is an old blade BL685c G1 and the network adapters used to provide network to vm are<br>
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07:04.0 Ethernet controller: Broadcom Limited NetXtreme BCM5715S Gigabit Ethernet (rev a3)<br>
07:04.1 Ethernet controller: Broadcom Limited NetXtreme BCM5715S Gigabit Ethernet (re<br>
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managed by tg3 kernel module, as I see in messages:<br>
<br>
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<br>
Jan 21 18:53:33 ovmsrv05 kernel: tg3 0000:07:04.0 eth0: attached PHY is 5714 (1000Base-SX Ethernet) (WireSpeed[0], EEE[0])<br>
Jan 21 18:53:33 ovmsrv05 kernel: tg3 0000:07:04.0 eth0: RXcsums[1] LinkChgREG[0] MIirq[0] ASF[0] TSOcap[1]<br>
Jan 21 18:53:33 ovmsrv05 kernel: tg3 0000:07:04.0 eth0: dma_rwctrl[76148000] dma_mask[40-bit]<br>
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<br>
Jan 21 18:53:33 ovmsrv05 kernel: tg3 0000:07:04.1 eth1: attached PHY is 5714 (1000Base-SX Ethernet) (WireSpeed[0], EEE[0])<br>
Jan 21 18:53:33 ovmsrv05 kernel: tg3 0000:07:04.1 eth1: RXcsums[1] LinkChgREG[0] MIirq[0] ASF[0] TSOcap[1]<br>
Jan 21 18:53:33 ovmsrv05 kernel: tg3 0000:07:04.1 eth1: dma_rwctrl[76148000] dma_mask[40-bit]<br>
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The 2 adapters are in bonding active-backup mode.<br>
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They are on vlan, so on hypervisor I have bond1.65 device and in vm the virtual interface is untagged<br>
<br>
[root@ovmsrv05 ~]# ifconfig bond1.65<br>
bond1.65: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500<br>
ether 00:1c:c4:46:ef:73 txqueuelen 1000 (Ethernet)<br>
RX packets 4368 bytes 257675 (251.6 KiB)<br>
RX errors 0 dropped 0 overruns 0 frame 0<br>
TX packets 238 bytes 28146 (27.4 KiB)<br>
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0<br>
<br>
[root@ovmsrv05 ~]# <br>
<br>
<br>
Currently Active Slave: enp7s4f0<br>
<br>
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<div>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.<br>
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<div>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:<br>
-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<br>
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<div>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...<br>
</div>
Currently, the configuration for adapter on the blade is<br>
<br>
[root@ovmsrv05 ~]# ethtool -k enp7s4f0<br>
Features for enp7s4f0:<br>
rx-checksumming: on<br>
tx-checksumming: on<br>
tx-checksum-ipv4: on<br>
tx-checksum-ip-generic: off [fixed]<br>
tx-checksum-ipv6: off [fixed]<br>
tx-checksum-fcoe-crc: off [fixed]<br>
tx-checksum-sctp: off [fixed]<br>
scatter-gather: on<br>
tx-scatter-gather: on<br>
tx-scatter-gather-fraglist: off [fixed]<br>
tcp-segmentation-offload: off<br>
tx-tcp-segmentation: off [requested on]<br>
tx-tcp-ecn-segmentation: off [fixed]<br>
tx-tcp6-segmentation: off [fixed]<br>
udp-fragmentation-offload: off [fixed]<br>
generic-segmentation-offload: on<br>
generic-receive-offload: on<br>
large-receive-offload: off [fixed]<br>
rx-vlan-offload: on [fixed]<br>
tx-vlan-offload: on [fixed]<br>
ntuple-filters: off [fixed]<br>
receive-hashing: off [fixed]<br>
highdma: on<br>
rx-vlan-filter: off [fixed]<br>
vlan-challenged: off [fixed]<br>
tx-lockless: off [fixed]<br>
netns-local: off [fixed]<br>
tx-gso-robust: off [fixed]<br>
tx-fcoe-segmentation: off [fixed]<br>
tx-gre-segmentation: off [fixed]<br>
tx-ipip-segmentation: off [fixed]<br>
tx-sit-segmentation: off [fixed]<br>
tx-udp_tnl-segmentation: off [fixed]<br>
tx-mpls-segmentation: off [fixed]<br>
fcoe-mtu: off [fixed]<br>
tx-nocache-copy: off<br>
loopback: off<br>
rx-fcs: off [fixed]<br>
rx-all: off [fixed]<br>
tx-vlan-stag-hw-insert: off [fixed]<br>
rx-vlan-stag-hw-parse: off [fixed]<br>
rx-vlan-stag-filter: off [fixed]<br>
busy-poll: off [fixed]<br>
tx-sctp-segmentation: off [fixed]<br>
l2-fwd-offload: off [fixed]<br>
hw-tc-offload: off [fixed]<br>
[root@ovmsrv05 ~]# <br>
<br>
<br>
</div>
<div>systool shows no particular parameters for tg3 kernel module available<br>
[root@ovmsrv05 ~]# systool -v -m tg3<br>
Module = "tg3"<br>
<br>
Attributes:<br>
coresize = "170653"<br>
initsize = "0"<br>
initstate = "live"<br>
refcnt = "0"<br>
rhelversion = "7.3"<br>
srcversion = "D276F97F491ADECC61C8284"<br>
taint = ""<br>
uevent = <store method only><br>
version = "3.137"<br>
<br>
Sections:<br>
...<br>
<br>
</div>
<div>Thanks,<br>
</div>
<div>Gianluca<br>
</div>
</div>
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