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From: Nikos Vassiliadis <nvass@teledomenet.gr>
To: Andras GELANYI <andras@gelanyi.hu>
Date: Fri, 5 Jan 2007 12:57:38 +0200
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Cc: freebsd-questions@freebsd.org
Subject: Re: vpn client (pptp) inside a jail
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On Thursday 04 January 2007 16:26, Andras GELANYI wrote:
> i do not really have a complete plan at the moment but an idea to use a
> jail on my remote system as a sandbox. i mean i would like to set up a jail
> and use it (sometimes) as client / virtual machine in a remote network
> through some kind of tunneling without any modification to the base system
> and sometimes as a regular host to test and compile some completelydifferent
> stuff.

AFAIK you won't be able to do that with jails. Mainly because:

Modifying the network configuration, including interfaces, addresses and
routing table, is prohibited. Accessing raw, divert and routing sockets are
prohibited. For example, a jail is bound to only one IP address and firewall
rules cannot be changed.

Taken from here:
http://en.wikipedia.org/wiki/Freebsd_jail#Security

Nikos