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ARP moved on nas4free server

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Hello
I have a very simple setup with one proxmox host with 3 network interfaces and a nas4free server used as iscsi storage.

One of the interfaces is used to connect to internet and the other two are used for iscsi.
The iscsi interfaces are on a dedicated switch so there is no physical connection between iscsi and other network.

I keep getting these messages on the nas4free log files.

Code:

arp: 192.168.200.30 moved from 00:15:17:63:56:4e to 00:15:17:63:56:4f on em0
arp: 192.168.201.30 moved from 00:15:17:63:56:4f to 00:15:17:63:56:4e on em1
arp: 192.168.200.30 moved from 00:15:17:63:56:4f to 00:15:17:63:56:4e on em0
arp: 192.168.201.30 moved from 00:15:17:63:56:4e to 00:15:17:63:56:4f on em1
arp: 192.168.200.30 moved from 00:15:17:63:56:4e to 00:15:17:63:56:4f on em0
arp: 192.168.201.30 moved from 00:15:17:63:56:4f to 00:15:17:63:56:4e on em1

em0 and em1 are the iscsi nics on the nas4free server.

This is the network config of the proxmox host; eth0 is the internet nic and eth2/eth3 are the iscsi nics

Code:

eth0      Link encap:Ethernet  HWaddr 00:1e:4f:20:32:3b            inet6 addr: fe80::21e:4fff:fe20:323b/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1032346 errors:0 dropped:0 overruns:0 frame:0
          TX packets:940185 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1025941053 (978.4 MiB)  TX bytes:96790027 (92.3 MiB)


eth2      Link encap:Ethernet  HWaddr 00:15:17:63:56:4e 
          inet addr:192.168.200.30  Bcast:192.168.200.255  Mask:255.255.255.0
          inet6 addr: fe80::215:17ff:fe63:564e/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:84037148 errors:0 dropped:568 overruns:0 frame:0
          TX packets:55748736 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:88598257398 (82.5 GiB)  TX bytes:39459734170 (36.7 GiB)
          Interrupt:16 Memory:fc3e0000-fc400000


eth3      Link encap:Ethernet  HWaddr 00:15:17:63:56:4f 
          inet addr:192.168.201.30  Bcast:192.168.201.255  Mask:255.255.255.0
          inet6 addr: fe80::215:17ff:fe63:564f/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:89541611 errors:0 dropped:12933 overruns:0 frame:0
          TX packets:55686388 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:94854825994 (88.3 GiB)  TX bytes:39316043550 (36.6 GiB)
          Interrupt:17 Memory:fc3a0000-fc3c0000

Does anyone have idea of what can cause this problem?

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