Comment 27 for bug 113622

Almost: it is possible to create a routing entry using the dialog so that specific addresses are routed through the tunnel. But additionally it creates a wrong routing entry like this (which tries to route the pptp server over the gateway):

172.16.3.253 172.16.3.254 255.255.255.255 UGH 0 0 0 eth0

which is wrong and has to be deleted (route del 172.16.3.253) and replaced by an entry for the interface:
route add 172.16.3.253 dev eth0
resulting in:
172.16.3.253 0.0.0.0 255.255.255.255 UH 0 0 0 eth0

Only after doing these two steps manually it is possible to use the pptp interface.

But I agree with you that this is an upstream issue.

Christian.