I have a urgent problem to solve today, but I'm lost. Please help.

I've cloned a Virtual Machine hosted on VM Ware ESXi 4.1
The OS is now Ubuntu Server 12.04 LTS, but at the time of cloning it was 10.04 LTS.

I fixed the MAC address manually inside /etc/udev/rules.d/70-persistent-net.rules. It is a known problem on Ubuntu. I had to remove the old MAC address and set the new one as eth0.

Everything seems to work fine, except ARP. My provider OVH sent me a warning to resolve it today (this is the second day) or they will block my IP!

The log contains many lines like this:

Tue Jun 5 01:04:29 2012 : arp who-has 178.32.136.212 tell 178.32.136.224

where .224 is the cloned server that is causing problems, and .212 is the cloned one.

arp -na returns:

? (178.33.230.254) at 00:07:b4:00:00:02 [ether] on eth0
? (178.32.136.212) at 00:50:56:09:8e:f1 [ether] on eth0

The first IP is the ESXi machine. The second one should not be there.

I'm not an expert and I don't know what else to do to fix this problem. Any help will be very appreciated.

Thanks.

EDIT:

ifcofig on .224:

eth0  Link encap:Ethernet  HWaddr 00:50:56:01:32:c6
      inet addr:178.32.136.224  Bcast:178.32.136.255  Mask:255.255.255.0
      inet6 addr: fe80::250:56ff:fe01:32c6/64 Scope:Link
      UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
      RX packets:399924 errors:0 dropped:465 overruns:0 frame:0
      TX packets:241884 errors:0 dropped:0 overruns:0 carrier:0
      collisions:0 txqueuelen:1000
      RX bytes:58006071 (58.0 MB)  TX bytes:663603166 (663.6 MB)

lo    Link encap:Local Loopback
      inet addr:127.0.0.1  Mask:255.0.0.0
      inet6 addr: ::1/128 Scope:Host
      UP LOOPBACK RUNNING  MTU:16436  Metric:1
      RX packets:516216 errors:0 dropped:0 overruns:0 frame:0
      TX packets:516216 errors:0 dropped:0 overruns:0 carrier:0
      collisions:0 txqueuelen:0
      RX bytes:236284275 (236.2 MB)  TX bytes:236284275 (236.2 MB)

ifconfig on .212:

eth0  Link encap:Ethernet  HWaddr 00:50:56:09:8e:f1
      inet addr:178.32.136.212  Bcast:178.32.136.255  Mask:255.255.255.0
      inet6 addr: fe80::250:56ff:fe09:8ef1/64 Scope:Link
      UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
      RX packets:16014 errors:0 dropped:0 overruns:0 frame:0
      TX packets:14511 errors:0 dropped:0 overruns:0 carrier:0
      collisions:0 txqueuelen:1000
      RX bytes:15134444 (15.1 MB)  TX bytes:2683025 (2.6 MB)

lo    Link encap:Local Loopback
      inet addr:127.0.0.1  Mask:255.0.0.0
      inet6 addr: ::1/128 Scope:Host
      UP LOOPBACK RUNNING  MTU:16436  Metric:1
      RX packets:9944 errors:0 dropped:0 overruns:0 frame:0
      TX packets:9944 errors:0 dropped:0 overruns:0 carrier:0
      collisions:0 txqueuelen:0
      RX bytes:1139347 (1.1 MB)  TX bytes:1139347 (1.1 MB)