VMWare+Ubuntu server 12.04 ARP telling network wrong MAC
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" <email@example.com> wrote:
> 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?
> Mike A. Leonetti
> As warm as green tea
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