VMWare+Ubuntu server 12.04 ARP telling network wrong MAC

[Mike A. Leonetti]

Turns out the issue was that the bridged interface was wireless. The moral of the story: you may not be able to have different MAC addresses on a wireless nic. I've learned something today.

Mike A. Leonetti
As warm as green tea

Bother Mike anytime on his iPhone!

On 2012/08/07, at 15:57, "Michael A. Leonetti" <mikealeonetti at gmail.com> wrote:

> Hello,
> 
> 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:10.0.0.137  Bcast:10.0.0.255  Mask:255.255.255.0
>           inet6 addr: fe80::250:56ff:fe25:582d/64 Scope:Link
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           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
> 10.0.0.137               ether   00:23:14:52:9f:18   C                     br0
> 
> tcpdump reveals that it is even the router (10.0.0.1) 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 10.0.0.137 tell 10.0.0.1 
> 15:09:25.442510 00:23:14:52:9f:18 > 00:1a:4d:74:fc:b8, ethertype ARP (0x0806), length 60: arp reply 10.0.0.137 is-at 00:23:14:52:9f:18
> 
> Of course the host windows system sees the correct MAC address
> 10.0.0.137 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?
> 
> Thanks
> 
> --
> Mike A. Leonetti
> As warm as green tea