Entering promiscuous mode kills ethernet connection

Hi!

I started with a completely new ubuntu installation (ubuntu-14.04.1lts-lubuntu-odroid-u-20140814). My device is connected with ethernet and I plugged in a wlan stick. I am accessing the computer via vnc (of course via ethernet).

Using gnome network manager I connect to my wireless network. When I start Wireshark in promiscuous mode odroid's ethernet connection is lost immediately and of course vnc stops working.

This is what syslog tells me:

Oct 30 00:38:02 odroid kernel: [ 1851.202209] wlan2: deauthenticating from blabla by local choice (reason=3)
Oct 30 00:36:35 odroid wpa_supplicant[996]: message repeated 2 times: [ wlan2: CTRL-EVENT-SCAN-STARTED ]
Oct 30 00:38:02 odroid wpa_supplicant[996]: wlan2: CTRL-EVENT-DISCONNECTED bssid=blabla reason=3 locally_generated=1
Oct 30 00:38:02 odroid NetworkManager[610]: <warn> Connection disconnected (reason -3)
Oct 30 00:38:02 odroid kernel: [ 1851.282762] cfg80211: Calling CRDA to update world regulatory domain
Oct 30 00:38:02 odroid avahi-daemon[502]: Interface wlan2.IPv6 no longer relevant for mDNS.
Oct 30 00:38:02 odroid avahi-daemon[502]: Leaving mDNS multicast group on interface wlan2.IPv6 with address blabla.
Oct 30 00:38:02 odroid avahi-daemon[502]: Interface wlan2.IPv4 no longer relevant for mDNS.
Oct 30 00:38:02 odroid avahi-daemon[502]: Leaving mDNS multicast group on interface wlan2.IPv4 with address 192.168.2.152.
Oct 30 00:38:02 odroid dhclient: receive_packet failed on wlan2: Network is down
Oct 30 00:38:03 odroid avahi-daemon[502]: Withdrawing address record for blabla on wlan2.
Oct 30 00:38:03 odroid avahi-daemon[502]: Withdrawing address record for 192.168.2.152 on wlan2.
Oct 30 00:38:03 odroid avahi-daemon[502]: Joining mDNS multicast group on interface wlan2.IPv4 with address 192.168.2.152.
Oct 30 00:38:03 odroid avahi-daemon[502]: New relevant interface wlan2.IPv4 for mDNS.
Oct 30 00:38:03 odroid avahi-daemon[502]: Registering new address record for 192.168.2.152 on wlan2.IPv4.
Oct 30 00:38:03 odroid avahi-daemon[502]: Interface wlan2.IPv4 no longer relevant for mDNS.
Oct 30 00:38:03 odroid avahi-daemon[502]: Leaving mDNS multicast group on interface wlan2.IPv4 with address 192.168.2.152.
Oct 30 00:38:03 odroid avahi-daemon[502]: Withdrawing address record for 192.168.2.152 on wlan2.
Oct 30 00:38:03 odroid kernel: [ 1851.636409] device wlan2 entered promiscuous mode
Oct 30 00:38:03 odroid NetworkManager[610]: <info> (wlan2): supplicant interface state: completed -> scanning
Oct 30 00:38:03 odroid avahi-daemon[502]: Joining mDNS multicast group on interface wlan2.IPv4 with address 192.168.2.152.
Oct 30 00:38:03 odroid avahi-daemon[502]: New relevant interface wlan2.IPv4 for mDNS.
Oct 30 00:38:03 odroid avahi-daemon[502]: Registering new address record for 192.168.2.152 on wlan2.IPv4.
Oct 30 00:38:05 odroid ntpd[1712]: Deleting interface #6 wlan2, blabla#123, interface stats: received=0, sent=0, dropped=0, active_time=1800 secs
Oct 30 00:38:05 odroid ntpd[1712]: peers refreshed
Oct 30 00:07:56 odroid whoopsie[774]: message repeated 5 times: [ online]
Oct 30 00:38:23 odroid whoopsie[774]: offline

What is happening here and how can I prevent it? Thanks for your help!