Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I want to build a roadwarrior ipsec gateway for routing traffic securely through my server.

For this, I plan to use racooon and debian linux. I have a VPS with a monolithic kernel (no kernel modules!), and since I need an internal NAT network for the VPn to work, I need some way to add a dummy interface to the kernel.

The question is, how can I see if dummy.ko is in the kernel built-in, and if it is, how can I activate it? modprobe dummy won't do. The VPS seems to be running under OpenVZ, and the kernel is from Redhat EL5. Is this impossible?

If there are other good solutions for accomplishing this roadwarrior setup, they'd be greatly appreciated.

share|improve this question

Use ifconfig to bring it up.

share|improve this answer
ifconfig just notifies me of "No such device" - does this mean my kernel simply does not have dummy.ko, not built in nor as a module? – tstm Aug 1 '11 at 20:39
It is possible. Many VPS providers have their own kernel which may not include all desired options. You'll have to talk to your host. – Ignacio Vazquez-Abrams Aug 1 '11 at 20:46
Heh, in fact, I had already halfway written to my host before creating this question. – tstm Aug 1 '11 at 20:51
The VPS seems to be running under OpenVZ, and the kernel is from Redhat EL5. Is this impossible?

You'll need to contact the administrator, it needs to add a privilege for you to use the modules. A dummy module isn't the only thing you'll need access to, there are 4 or 5 modules needed to have a OpenVPN server running, IPsec may need more.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.