[Bug 328508] [NEW] Wrong route after VPN connection

[Fabio Marzocca]

Public bug reported:

Binary package hint: network-manager-pptp

Intrepid 8.10
No way to use internet external  after a VPN connection, due to wrong route table.

When I connect to my VPN using Network Manager, I end up with the wrong
route table. Here's what I start with:

Destination Gateway Genmask Flags MSS Window irtt Iface
192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
0.0.0.0 192.168.0.1 0.0.0.0 UG 0 0 0 eth0

After connecting, I get this:

Destination Gateway Genmask Flags MSS Window irtt Iface
65.237.0.254 192.168.0.1 255.255.255.255 UGH 0 0 0 eth0
192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
0.0.0.0 0.0.0.0 0.0.0.0 U 0 0 0 ppp0

 I don't think the first entry should appear in my route table. There's
no reason for that. Also, the default route has been changed to ppp0. I
don't want that.  From my /var/log/messages file, I can see the endpoint
of the tunnel:

Feb 12 08:13:06 localhost pppd[5046]: local IP address 10.6.250.118
Feb 12 08:13:06 localhost pppd[5046]: remote IP address 10.6.250.25

I would expect the 10.6.250.25 to appear in the route table, if
anything.

Here's what I do manually to get back to normal:

sudo route add -net 10.6.0.0 netmask 255.255.0.0 dev ppp0
sudo route add -net default gw 192.168.0.1
sudo route del -net default dev ppp0

Now I have:

Destination Gateway Genmask Flags MSS Window irtt Iface
64.238.111.254 192.168.0.1 255.255.255.255 UGH 0 0 0 eth0
192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
10.6.0.0 0.0.0.0 255.255.0.0 U 0 0 0 ppp0
0.0.0.0 192.168.0.1 0.0.0.0 UG 0 0 0 eth0

and all works fine.

The nm-applet doesn't have a way to control my default route and won't
let me route my private networks via an interface -- the routes I can
add insist on an IP address for the gateway.

** Affects: network-manager-pptp (Ubuntu)
     Importance: Undecided
         Status: New

-- 
Wrong route after VPN connection
https://bugs.launchpad.net/bugs/328508
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