ethernet up and running (but it shouldn't)

Hi,

I'm running Ubuntu 7.10, and a I have a strange situation. My /etc/
network/interfaces file (the file which you normally write your
settings) is almost empty. I don't know how and why, but I'm sure It
wasn't like that. Now it only specifies the loopback interface:

---
ziphyre@neptune:~$ cat /etc/network/interfaces
auto lo
iface lo inet loopback
---

But still, my eth0 interface is up and running, here is the result of
ifconfig:

---
ziphyre@neptune:~$ ifconfig
eth0 Link encap:Ethernet HWaddr 00:1B:FC:CE:9A:A1
inet addr:10.0.0.100 Bcast:10.0.0.255 Mask:255.255.255.0
inet6 addr: fe80::21b:fcff:fece:9aa1/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:17421 errors:0 dropped:0 overruns:0 frame:0
TX packets:15754 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:19074955 (18.1 MB) TX bytes:2830562 (2.6 MB)
Interrupt:17 Base address:0xe000

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:66 errors:0 dropped:0 overruns:0 frame:0
TX packets:66 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:5104 (4.9 KB) TX bytes:5104 (4.9 KB)
---

As far as I know my eth0 should be down and I couldn't able to write
this message? Any clarification?
Thanks

Ziphyre wrote:
> Hi,
>
> I'm running Ubuntu 7.10, and a I have a strange situation. My /etc/
> network/interfaces file (the file which you normally write your
> settings) is almost empty. I don't know how and why, but I'm sure It
> wasn't like that. Now it only specifies the loopback interface:
>
> ---
> ziphyre@neptune:~$ cat /etc/network/interfaces
> auto lo
> iface lo inet loopback
> ---
>
> But still, my eth0 interface is up and running, here is the result of
> ifconfig:
>
> ---
> ziphyre@neptune:~$ ifconfig
> eth0 Link encap:Ethernet HWaddr 00:1B:FC:CE:9A:A1
> inet addr:10.0.0.100 Bcast:10.0.0.255 Mask:255.255.255.0
> inet6 addr: fe80::21b:fcff:fece:9aa1/64 Scope:Link
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:17421 errors:0 dropped:0 overruns:0 frame:0
> TX packets:15754 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:1000
> RX bytes:19074955 (18.1 MB) TX bytes:2830562 (2.6 MB)
> Interrupt:17 Base address:0xe000
>
> lo Link encap:Local Loopback
> inet addr:127.0.0.1 Mask:255.0.0.0
> inet6 addr: ::1/128 Scope:Host
> UP LOOPBACK RUNNING MTU:16436 Metric:1
> RX packets:66 errors:0 dropped:0 overruns:0 frame:0
> TX packets:66 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:0
> RX bytes:5104 (4.9 KB) TX bytes:5104 (4.9 KB)
> ---
>
> As far as I know my eth0 should be down and I couldn't able to write
> this message? Any clarification?
> Thanks
>

That is udev at work!

Robert

>
> That is udev at work!
>
> Robert


Thanks

Robert Harris wrote:

[snipped]

>
> That is udev at work!

or NetworkManager.

>
> Robert

udev in Ubuntu, on detection of network interface invokes 'ifup' and that
too only for those interfaces which're marked with auto.

HTH
--
Ashish Shukla आशीष श�क�ल http://wahjava.wordpress.com/
·-- ·- ···· ·--- ·- ···- ·- ·--·-· --· -- ·- ·· ·-·· ·-·-·- -·-· --- --