egrep -i 'net|eth|wlan|firm|reason' /var/log/syslog
Dec  5 15:24:29 mk-AMILO-Pa-1510 kernel: [ 2488.408492] 8139too 0000:05:05.0 eth0: link down
Dec  5 15:24:29 mk-AMILO-Pa-1510 NetworkManager[730]: <info> (eth0): carrier now OFF (device state 100, deferring action for 4 seconds)
Dec  5 15:24:34 mk-AMILO-Pa-1510 NetworkManager[730]: <info> (eth0): device state change: activated -> unavailable (reason 'carrier-changed') [100 20 40]
Dec  5 15:24:34 mk-AMILO-Pa-1510 NetworkManager[730]: <info> (eth0): deactivating device (reason 'carrier-changed') [40]
Dec  5 15:24:34 mk-AMILO-Pa-1510 NetworkManager[730]: <info> (eth0): canceled DHCP transaction, DHCP client pid 803
Dec  5 15:24:34 mk-AMILO-Pa-1510 avahi-daemon[566]: Withdrawing address record for 192.168.1.17 on eth0.
Dec  5 15:24:34 mk-AMILO-Pa-1510 avahi-daemon[566]: Leaving mDNS multicast group on interface eth0.IPv4 with address 192.168.1.17.
Dec  5 15:24:34 mk-AMILO-Pa-1510 avahi-daemon[566]: Interface eth0.IPv4 no longer relevant for mDNS.
Dec  5 15:24:34 mk-AMILO-Pa-1510 NetworkManager[730]: <info> Policy set 'Mafia' (wlan0) as default for IPv4 routing and DNS.
Dec  5 15:24:34 mk-AMILO-Pa-1510 NetworkManager[730]: <info> Writing DNS information to /sbin/resolvconf