Switch ISPs and lost internet connection on debian server
  
 
     
     
             
                 
 
 
         
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 Version   root@server:~# cat /etc/debian_version  8.11    Can't resolve host names   root@server:~# ping www.google.com  ping: unknown host www.google.com    ifconfig -a   root@server:/# ifconfig -a  docker0    Link encap:Ethernet HWaddr 02:42:cc:08:fa:30             inet addr:172.17.0.1  Bcase:172.17.255.255  Mask:255.255.0.0             UP BROADCAST MULTICAST  MTU:1500  Metric:1             RX packets:0 errors:0 dropped:0 overruns:0 frame:0             TX packets:0 errors:0 dropped:0 overruns:0 carrier:0             collisions:0 txqueuelen:0             RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)   eth0       Link encap:Ethernet  HWaddr 48:5b:39:c1:ce54             UP BROADCAST MULTICAST  MTU:1500  Metric:1             RX packets:0 errors:0 dropped:0 overruns:0 frame:0             TX packets:45 errors:0 dropped:0 over...