[root@server]# modprobe ppp_generic
[root@server]# vzctl set 100 --devices c:108:0:rw --save
Setting devices
Saved parameters for VPS 100
[root@server]# vzctl enter 100
entered into VPS 100
-bash-3.00# mknod /dev/ppp c 108 0
-bash-3.00# pptp vpn-server.com
/usr/sbin/pppd: This system lacks kernel support for PPP.  This could be because
the PPP kernel module could not be loaded, or because PPP was not
included in the kernel configuration.  If PPP was included as a
module, try `/sbin/modprobe -v ppp'.  If that fails, check that
ppp.o exists in /lib/modules/`uname -r`/net.
See README.linux file in the ppp distribution for more details.

-bash-3.00#