VMWare+Ubuntu server 12.04 ARP telling network wrong MAC

Michael A. Leonetti mikealeonetti at gmail.com
Tue Aug 7 19:57:12 UTC 2012


I have an Ubuntu server 12.04 running on Windows 7 in network bridged mode.
The Internet works fine. The machine is pingable. However it's showing up
on the router as the wrong Mac address.

The machine says:
# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:50:56:25:58:2d
          inet addr:  Bcast:  Mask:
          inet6 addr: fe80::250:56ff:fe25:582d/64 Scope:Link
          RX packets:992 errors:0 dropped:0 overruns:0 frame:0
          TX packets:80 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:99676 (99.6 KB)  TX bytes:10285 (10.2 KB)
          Interrupt:19 Base address:0x2000

But the rourter says
# arp
Address                  HWtype  HWaddress           Flags Mask
Iface               ether   00:23:14:52:9f:18   C

tcpdump reveals that it is even the router ( is being told the
wrong address:
15:09:25.440473 00:1a:4d:74:fc:b8 > ff:ff:ff:ff:ff:ff, ethertype ARP
(0x0806), length 42: arp who-has tell
15:09:25.442510 00:23:14:52:9f:18 > 00:1a:4d:74:fc:b8, ethertype ARP
(0x0806), length 60: arp reply is-at 00:23:14:52:9f:18

Of course the host windows system sees the correct MAC address 00-50-56-25-58-2d dynamic

But the rest of the network does not. Has anybody seen this or know what
steps I could take to fix it?


Mike A. Leonetti
As warm as green tea
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