device eth0 entered promiscuous mode

Hi all,

I noticed something strange in my logs today, it never appears to have happened (certainly since March) before. 

Dec 17 09:15:57 despair kernel: device eth0 entered promiscuous mode
Dec 17 09:16:02 despair kernel: device eth0 left promiscuous mode

And then...

Dec 22 14:58:26 despair kernel: device eth0 entered promiscuous mode

My device is currently in Promiscous mode too, it has not left it since.

I was not logged into the device via Web or SSH around this time and I had a look at the last logins to check nobody else had gained access. I am just curious what's going on and what may cause the interface to switch to promiscous mode. Normally only TCPDUMP causes this to happen.

I did also check running processes, I find this one a little odd:

avahi-daemon: running [despair.local]

Thanks...