Comment 17 for bug 364844

I am having a similar problem using an up-to-date Karmic Ubuntu 9.10 64-bit, same network=manager-vpnc as above (0.8~a~git.20091008t124012.f5b95a2-0ubuntu1):

First, with NM-vpnc I get
$ route -ne
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
192.168.4.11 10.112.0.1 255.255.255.255 UGH 0 0 0 eth0
193.15.192.0 0.0.0.0 255.255.240.0 U 0 0 0 tun0
10.112.0.0 0.0.0.0 255.255.128.0 U 0 0 0 eth0
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0
0.0.0.0 0.0.0.0 0.0.0.0 U 0 0 0 tun0
$ ping google.com
^C

Then using vpnc on the CLI
$ sudo vpnc-connect
VPNC started in background (pid: 10594)...
$ route -ne
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
192.168.4.11 10.112.0.1 255.255.255.255 UGH 1500 0 0 eth0
193.15.192.0 0.0.0.0 255.255.240.0 U 0 0 0 tun0
10.112.0.0 0.0.0.0 255.255.128.0 U 0 0 0 eth0
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0
0.0.0.0 0.0.0.0 0.0.0.0 U 0 0 0 tun0
$ ping google.com
PING google.com (209.85.225.99) 56(84) bytes of data.
64 bytes from iy-in-f99.1e100.net (209.85.225.99): icmp_seq=1 ttl=54 time=32.5 ms
^C
--- google.com ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 32.517/32.517/32.517/0.000 ms

The only difference I see is in the MSS value: 1500 when connected and working from vpnc-connect, 0 when using the NM-vpnc GUI.