Ubuntu
openssh package

How to overcome "tun0: Disabled Privacy Extensions"?

Asked by Uqbar

I need to open a tunnel between two machine of mine where I hold root access.
I've read this document: https://help.ubuntu.com/community/SSH_VPN .
I've set up a key pair between the two machine's root account (~root/.ssh), I've changed the sshd_config with the following
parameters:

PermitTunnel yes
PermitRootLogin without-password

while "PermitRootLogin yes" was already there.
I've then run the following command on one machine:

sudo ssh -NTCf -w 0:0

The ssh command goes background but no tun0 interface is created.
Moreover, the system log says: "tun0: Disabled Privacy Extensions"

How can I fix this thing?
Googling didn't provide any useful help so far.

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Ubuntu openssh Edit question
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Solved by:
Theodotos Andreou
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Best Theodotos Andreou (theodotos) said : 		#1

Try installing the uml-utilities and try again. In Terminal:

  sudo apt-get install uml-utilities

You can test if it works by creating a tun interface like this:

  tunctl -u $USER

Revision history for this message
Uqbar (uqbar) said : 		#2

That works as root.
But it creates tap0, not tun0!

Revision history for this message
Uqbar (uqbar) said : 		#3

It works!
Now the command "sudo ssh -NTCf -w 0:0" has created the local tun0 interface.
On the remote machine I can also see the tun0 interface.
So the point is that I was missing the uml-utilities.
You rock, Theodotos!
Ευχαριστώ σας!

Revision history for this message
Uqbar (uqbar) said : 		#4

Thanks Theodotos Andreou, that solved my question.

Revision history for this message
Theodotos Andreou (theodotos) said : 		#5

You really touch me with the Greek! You are most welcome.

I think we should add this information in the help page you reference above because it confuses people. I 'll try to contact the author.