how to manually setup pptp vpn in linux?

Question

I tried to setup the pptp vpn in ubuntu i.e

 /etc/ppp/peers/myvpn

Its contents are

pty "pptp <host> --nolaunchpppd"
name myusername
remotename myvpn
linkname myvpn 
ipparam myvpn
usepeerdns
require-mppe
file /etc/ppp/options.pptp

But using this settings i can establish the tunnel and I even get the private IP of the VPN network , but I cannot ssh into any machine or not even ping to any other machine except for itself.

Answer 1

Your machine is probably using the wrong interface to send out packets to machines in the VPN. After establishing the VPN tunnel, you usually have to set a route for the VPN:

ip r add $VPN-net via $Peer dev $VPN-device

e.g.:

ip r add 10.3.0.0/17 via 10.30.100.40 dev ppp0