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

Vincent Trouilliez vincent.trouilliez at
Wed Jan 28 18:41:01 UTC 2009

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

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:  Bcast:
Mask: inet6 addr: fe80::21d:92ff:fe6e:b536/64 Scope:Link
          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 


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