I posted a while back about routing problems when using a VPN over mobile
broadband. I've just been trying the most recent builds on launchpad (two
of them), and the routing setup has changed, but it's still not quite right.
Both builds do the same thing - here are the routes for the PPP connection,
and then PPTP over PPP.
PPP only:
Destination Gateway Genmask Flags Metric Ref Use
Iface
10.37.79.0 0.0.0.0 255.255.255.255 UH 0 0 0 ppp0
169.254.0.0 0.0.0.0 255.255.0.0 U 1000 0 0 ppp0
0.0.0.0 10.37.79.0 0.0.0.0 UG 0 0 0 ppp0
PPTP over PPP
Destination Gateway Genmask Flags Metric Ref Use
Iface
192.168.7.128 10.37.69.0 255.255.255.255 UGH 0 0 0 ppp0
10.37.69.0 0.0.0.0 255.255.255.255 UH 0 0 0 ppp0
82.153.174.82 10.37.69.0 255.255.255.255 UGH 0 0 0 ppp0
0.0.0.0 0.0.0.0 0.0.0.0 U 0 0 0 ppp1
10.37.79.0 is the PPP peer for the session, 82.153.174.82 is the public
address of the VPN host, and 192.168.7.128 is its internal address within
the VPN. The 3rd route entry above in PPTP mode was previously missing
(provides the route for PPTP to send its packets to the server), so this is
good.
However, the first entry is wrong, and should not be there. The address
192.168.7.128 only exists within the VPN, so can't possibly be routed over
the PPP gateway. With this route present, the VPN won't work, but if this
route is deleted after the VPN is established, all hosts on the VPN can be
contacted as expected.
The two launchpad builds I used are:
<https://launchpad.net/~network-manager/+archive>
- I upgraded all the NM components with these versions
<https://launchpad.net/ubuntu/+source/network-manager-pptp/0.7~~svn20081015t024626-0ubuntu1.8.10.1/+build/792016>
- I installed this over the top (apt says it's an earlier version, although
it's a later date). This is dated 20 Nov, so I'm assuming there have been
no fixes since?
HTH, Rick
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