ifup, ifdown not working

[monkeyking]

hi,
I used to be able to put a interface up and down.
Using

ifdown eth0
ifup eth0

But now it says

ifdown: interface eth0 not configured

btw I'm sure my netinterface is eth0

eth0      Link encap:Ethernet  HWaddr 00:18:8b:6a:a8:76  
          inet addr:192.38.114.195  Bcast:192.38.114.255  Mask:255.255.255.0
          inet6 addr: fe80::218:8bff:fe6a:a876/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:97665 errors:0 dropped:0 overruns:0 frame:0
          TX packets:32849 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:61857885 (58.9 MB)  TX bytes:4110712 (3.9 MB)
          Interrupt:16

The problem is not, that I'm not on the internet,
I just need a commandline command, for putting it up and down.


thanks in advance

[oldmanteabags]

Try

ifconfig eth0 down
ifconfig eth0 up

[nitro_n2o]

what is the content of /etc/network/interfaces

[monkeyking]

The ifconfig eth0 up/down command works.
But my network goes up immidiatly after I pull it down.
Do anyone have any ideas?


This is my interface file, should I just add eth0, to make everything work?

cat /etc/network/interfaces 
auto lo
iface lo inet loopback

[oldmanteabags]

confirm the config of eth0, by using

ifconfig eth0

respwaning eth0, good one.

just some ideas
check wake on lan and deactivate,
match the hardware to the driver with

lspci

**EDIT** -- My interface file is the same as yours and my eth0 is working fine. not sure why the eth0 entry is not listed. things sure are changing.

[caljohnsmith]

The ifconfig eth0 up/down command works.
But my network goes up immidiatly after I pull it down.
Do anyone have any ideas?

This is my interface file, should I just add eth0, to make everything work?

cat /etc/network/interfaces 
auto lo
iface lo inet loopback

Just an FYI, but for ifup/ifdown to work, your interface needs to configured in the /etc/network/interfaces file. From the man page:

DESCRIPTION
The ifup and ifdown commands may be used to configure (or, respec‐tively, deconfigure) network interfaces based on interface definitions in the file /etc/network/interfaces.

So if you want to use ifup/ifdown, you could put your eth0 interface into /etc/network/interfaces like:

iface eth0 inet dhcp
auto eth0

[monkeyking]

Thanks, after including my eth0 to /etc/network/interfaces

Everything works as usual

thanks