I'm having a similar issue I just upgrade to 15.10 from 14.04 and I
started having the same issue.  I would connect from the CLI using vpnc-
connect and my saved profile.  However once connect I would not be able
to access any resource on the other side of the tunnel.  It appeared to
be a routing error but I had no way of confirming that.

In an effort to solve this I installed nm-applet-vpnc and connected with
it and everything worked correctly.  I took a look at the routes using
netstat -r and there was a sicrepancy.


netstat -r after connect from CLI
$ netstat -r
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
default         10.0.0.1        0.0.0.0         UG        0 0          0 wlan0
10.0.0.0        *               255.255.255.0   U         0 0          0 wlan0
link-local      *               255.255.0.0     U         0 0          0 wlan0
<TUNNEL IP>     *               255.255.255.240 U         0 0          0 tun0
<MYPORTAL> 10.0.0.1        255.255.255.255 UGH       0 0          0 wlan0


netstat -r after connect using nm-applet-vpnc
$ netstat -r
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
default         *               0.0.0.0         U         0 0          0 tun0
default         10.0.0.1        0.0.0.0         UG        0 0          0 wlan0
10.0.0.0        *               255.255.255.0   U         0 0          0 wlan0
link-local      *               255.255.0.0     U         0 0          0 wlan0
<TUNNEL IP>     *               255.255.255.240 U         0 0          0 tun0
<MYPORTAL> 10.0.0.1        255.255.255.255 UGH       0 0          0 wlan0

I ran 
 sudo route add default tun0
Now netstat -r looks correct
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
default         *               0.0.0.0         U         0 0          0 tun0
default         10.0.0.1        0.0.0.0         UG        0 0          0 wlan0
10.0.0.0        *               255.255.255.0   U         0 0          0 wlan0
link-local      *               255.255.0.0     U         0 0          0 wlan0
<TUNNEL IP>     *               255.255.255.240 U         0 0          0 tun0
<MYPORTAL> 10.0.0.1        255.255.255.255 UGH       0 0          0 wlan0


And now everything is working correctly.
However it would be much preferred to not have to manual add the default route 
once the vpn connection is up.

FYI janl I can get the nm-applet-vpnc to prompt me for dual factor
authentication.

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https://bugs.launchpad.net/bugs/1513437

Title:
  Incorrect default routing after vpnc completes

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