PPP in container

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Our goal is to start the pppd daemon in a virtual machine. Then it is possible, for example, to connect to your DSL provider in a VM.


It is necessary to run one of these 3 kernels :

One other thing. I am not 100% sure about this but I think both the host and the container need to be running the same bit version OS. So both need to be 32bit or 64bit. That is what I found the one time I tried this running a 32bit container on a 64bit host.


  • ppp modules need to be loaded in the HN :
HN # modprobe ppp_async
HN # modprobe ppp_deflate
HN # modprobe ppp_mppe
HN # lsmod | grep ppp
ppp_mppe                6420  2
ppp_deflate             9793  2
zlib_deflate           21977  1 ppp_deflate
ppp_async              15169  1
crc_ccitt               6337  1 ppp_async
ppp_generic            30165  6 ppp_deflate,ppp_async
slhc                   10561  1 ppp_generic
  • to make these HN changes persistent on reboot create a file called ppp.modules. You can use any name you like but you must give it a .modules extension. The following method and directory location is applicable to CentOS v6. I am not sure about v5. The directory location may be different for that version.
HN # nano /etc/sysconfig/modules/ppp.modules

/sbin/modprobe ppp_async
/sbin/modprobe ppp_deflate
/sbin/modprobe ppp_mppe
HN # chmod +x /etc/sysconfig/modules/ppp.modules

  • set "ppp" feature for stoppped VE:
HN # vzctl set [VEnumber] --features ppp:on --save
  • start VE :
HN # vzctl start [VEnumber]
  • Prepare /dev/ppp within VE:
HN # vzctl set [VEnumber] --devices c:108:0:rw --save
HN # vzctl exec [VEnumber] mknod /dev/ppp c 108 0
HN # vzctl exec [VEnumber] chmod 600 /dev/ppp
  • See if it works (as root):
VE# /usr/sbin/pppd

You should see gibberish in the standard output like

~�}#�!}!}!} }4}"}&} } } } }%}&)Q�}4}'}"}(}"p})

This will go on for about 30 seconds and then you will be returned to a command prompt. If there is an error message instead, something went wrong.

  • From that point, you can finish your setup as in a real hardware environment.

See also