Internet: browsers fails to connect to SOME sites, not all, for no reason.

[Vincent Trouilliez]

I tried using a third party DNS, the famous "OpenDNS".
I used it in the past (just out of curiosity), with success.

https://www.opendns.com/homenetwork/start/device/ubuntu

However when trying doing the ifdown/up eth0, I got an error, a weird
one !

ifdown said:

"ifdown: interface eth0 not configured
Ignoring unknown interface eth0=eth0."


How on earth could I be able to browse websites if eth0 (only NIC in
the system), was not unknown and unconfigured !
This is getting crazy really :-/

I issued an ifconfig, see below, and as you would expect, eth0 is very
much there and undoubtly show my IP (my ISP always gives an
IP starting with 80 something).


**************************************
vincent at Lotus-Esprit:~$ ifconfig
eth0      Link encap:Ethernet  HWaddr 00:1d:92:6e:b5:36  
          inet addr:85.69.146.144  Bcast:85.69.146.255
Mask:255.255.255.0 inet6 addr: fe80::21d:92ff:fe6e:b536/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:2794792 errors:0 dropped:0 overruns:0 frame:0
          TX packets:178316 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:532366727 (532.3 MB)  TX bytes:34613822 (34.6 MB)
          Interrupt:219 Base address:0x6000 
****************************************


--
Vince