Ignoring unknown interface eth0=eth0

jdam1228 · 12-18-2010, 04:26 PM

Hey everyone, I don't consider myself to be a total newbie, I've been using all sorts of *nix builds for the last 6 years or so, but finally I've hit a retarded problem that I can't figure out, and I can't find the answer anywhere.

I'm running a dual boot Ubuntu 10.04/Backtrack 4 (Ubuntu 8.10) system. I can get internet in the BT4 side but not in the Lucid side. In Lucid I can ping my router, and the network manager says I'm good to go, but I can't get to any web sites. It all started when I tried to put my laptop on another network by mimicking the settings of a computer I had just unplugged from the network. MAC address and all. I have a feeling it might have to do with an unexpected MAC address somewhere, but I'm not sure

Below are posted all the relevant details I could think of for my network. Any help is GREATLY appreciate as I've been pounding my head against the wall for a week on this. (I'm set up using a static IP)

ifconfig eth0:

Code:

eth0      Link encap:Ethernet  HWaddr 00:1f:16:ba:4c:8c  
          inet addr:10.136.9.147  Bcast:10.136.9.159  Mask:255.255.255.240
          inet6 addr: fe80::21f:16ff:feba:4c8c/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:277 errors:0 dropped:0 overruns:0 frame:0
          TX packets:152 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:44433 (44.4 KB)  TX bytes:16428 (16.4 KB)
          Interrupt:16

when I restart networking it sometimes says this:

Code:

root@jon-laptop:/home/jon# /etc/init.d/networking restart
 * Reconfiguring network interfaces...                                          
Ignoring unknown interface eth0=eth0.
                                                                   [ OK ]

and sometimes says this:

Code:

root@jon-laptop:/home/jon# /etc/init.d/networking restart
 * Reconfiguring network interfaces...                                   [ OK ]

I haven't seen any rhyme or reason as to why sometimes it's one or the other.

dmesg | grep eth0 reveals this:

Code:

$ dmesg |grep eth0
[    1.373349] eth0: Tigon3 [partno(BCM95784M) rev 5784100] (PCI Express) MAC address 00:1f:16:ba:4c:8c
[    1.373353] eth0: attached PHY is 5784 (10/100/1000Base-T Ethernet) (WireSpeed[1])
[    1.373356] eth0: RXcsums[1] LinkChgREG[0] MIirq[0] ASF[0] TSOcap[1]
[    1.373358] eth0: dma_rwctrl[76180000] dma_mask[64-bit]
[   10.828396] ADDRCONF(NETDEV_UP): eth0: link is not ready
[   12.353917] tg3: eth0: Link is up at 100 Mbps, full duplex.
[   12.353921] tg3: eth0: Flow control is on for TX and on for RX.
[   12.354156] ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[   51.311949] Outbound IN= OUT=eth0 SRC=10.136.9.147 DST=91.189.94.4 LEN=76 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=UDP SPT=123 DPT=123 LEN=56

Thanks again!

xtothat · 12-19-2010, 12:32 AM

Hi, jdam,

I'm not in Ubuntu at the moment, so I can't look it up right now, but my first suggestion would be to read through the script /etc/init.d/networking, as it's just a script file, not a binary. See if you can work out how it reads the interface names, and then manually run these commands, seeing if you can add some debug code into the commands as you run them if you find any problems with it.

If you like, I can try and help you do this if you're not too comfortable reading shell scripts. Just post the contents of that file either here or on a code dump site, and I'll find you some commands to run!

Also, a couple of questions:

1 - Which files did you edit in trying to mimic the other settings?

2 - Is the IP address shown when you run `ifconfig eth0` correct for your network's subnet?

Any questions about what I've asked, feel absolutely free!

X-T

impert · 12-19-2010, 02:58 PM

What do you have in /etc/network/interfaces?

jdam1228 · 12-19-2010, 03:29 PM

Thanks everyone for the prompt and helpful replies. Here is the content of /etc/network/interfaces:

Code:

auto lo
iface lo inet loopback

#auto eth0

auto eth0
    iface eth0 inet static
            address 10.136.9.147
            netmask 255.255.255.240
            gateway 10.136.9.145

#iface eth0 inet dhcp

auto eth1
iface eth1 inet dhcp

auto eth2
iface eth2 inet dhcp

auto ath0
iface ath0 inet dhcp

auto wlan0
iface wlan0 inet dhcp

These are the correct settings for my network. I want the static IP to be 10.136.9.147, and the other information is right as well.
As far as I know, the only settings I changed in mimicking the network settings were in the network manager. I didn't go into the networking files and change anything.

Thanks again.