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Dummy IP Interface
https://forum.linode.com/viewtopic.php?f=19&t=764		 Page 1 of 1
Author:  dbuckley [ Tue Mar 23, 2004 6:23 pm ]
Post subject:  Dummy IP Interface
I'm need to set up a dummy IP interface on a Debian LiNode, and am failing at step one. I think I know what to do once I get past step one, but till I solve this, I'm stuck.

When I do:

# ifconfig dummy
dummy: error fetching interface information: Device not found

Same with dummy0

I think I need to do an insmod dummy, but when I try:

# insmod dummy
insmod: dummy: no module by that name found

And then I'm at the end of my linux knowledge. There doesnt appear to be a file like *dummy* in the filesystem. Where / how do I get this driver thing, and where do I put it? Is there a more permanent way of telling the kernel to load the driver on boot, or do I just stick the insmod command in the network startup?

Thanks.
Author:  caker [ Tue Mar 23, 2004 7:01 pm ]
Post subject: 
You could use tuntap, which is compiled into the UML kernels:

Code:
# install uml-utilities, which has the "tunctl" admin app:
apt-get install uml-utilities

# make the dev node, and make it world read/write-able, for non-root users (adjust to suit)
mkdir /dev/net/
mknod /dev/net/tun c 10 200
chmod 666 /dev/net/tun


Example usage:

Code:
li-20:~# tunctl --help
tunctl: invalid option -- -
Create: tunctl [-u owner] [-t device-name] [-f tun-clone-device]
Delete: tunctl -d device-name [-f tun-clone-device]

li-20:~# tunctl -u caker -t caker0
Set 'caker0' persistent and owned by uid 1000

li-20:~# ifconfig caker0 192.168.1.2
li-20:~# ifconfig caker0
caker0    Link encap:Ethernet  HWaddr 00:FF:C9:2A:40:FC  
          inet addr:192.168.1.2  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::2ff:c9ff:fe2a:40fc/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:3 overruns:0 carrier:0
          collisions:0 
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)

li-20:~#


-Chris
Author:  dbuckley [ Tue Mar 23, 2004 7:13 pm ]
Post subject: 
Giving it a go now.

How much of this stuff is persistent?

(this does look like strange voodoo...)
Author:  caker [ Tue Mar 23, 2004 8:33 pm ]
Post subject: 
dbuckley wrote:
How much of this stuff is persistent?

You will want to edit your init scripts to create and ifconfig the tap device on startup. The other stuff is run-once...

-Chris
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