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2015-07-15 08:29:24 -0600 asked a question VM can't ping gateway. Possibly ARP problem

Hi,

VM can't ping default gateway 192.168.0.1. arp -n inside VM shows that 192.168.0.1 has wrong MAC address. tcpdump shows that there are lot of wrong ARP responses from all qvb/qbr interfaces of other VMs in the same tenant. Static ARP record inside VM with correct MAC fixes the issue. Running neutron in VXLAN mode.

Why does this happens?

12:12:49.726576 fa:16:3e:9e:80:ce > fa:16:3e:0c:d5:74, ethertype ARP (0x0806), length 42: Reply 192.168.0.1 is-at fa:16:3e:9e:80:ce, length 28
12:12:49.726605 7a:1d:67:c1:9a:08 > fa:16:3e:0c:d5:74, ethertype ARP (0x0806), length 42: Reply 192.168.0.1 is-at 7a:1d:67:c1:9a:08, length 28
12:12:49.726610 46:a7:8a:0b:5b:f3 > fa:16:3e:0c:d5:74, ethertype ARP (0x0806), length 42: Reply 192.168.0.1 is-at 46:a7:8a:0b:5b:f3, length 28
12:12:49.726616 8e:d9:fa:06:6b:d3 > fa:16:3e:0c:d5:74, ethertype ARP (0x0806), length 42: Reply 192.168.0.1 is-at 8e:d9:fa:06:6b:d3, length 28
12:12:49.726620 2a:20:89:65:a9:88 > fa:16:3e:0c:d5:74, ethertype ARP (0x0806), length 42: Reply 192.168.0.1 is-at 2a:20:89:65:a9:88, length 28
12:12:49.726634 76:ba:16:b1:39:c0 > fa:16:3e:0c:d5:74, ethertype ARP (0x0806), length 42: Reply 192.168.0.1 is-at 76:ba:16:b1:39:c0, length 28
12:12:49.726648 42:65:d7:b4:08:0c > fa:16:3e:0c:d5:74, ethertype ARP (0x0806), length 42: Reply 192.168.0.1 is-at 42:65:d7:b4:08:0c, length 28
12:12:49.726670 5a:e8:26:85:38:19 > fa:16:3e:0c:d5:74, ethertype ARP (0x0806), length 42: Reply 192.168.0.1 is-at 5a:e8:26:85:38:19, length 28