what routes to add in order to make VPN work?

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http://www.linuxquestions.org – Hi, i installed the free PacketIX vpn client on my ubuntu 9.04. it created a virtual network adapter, i was able to configure and connect to the VPN service but when i add a default route to the routing table so that all internet traffic goes through the VPN, my internet connection stops working until i remove the line i added. here's my routing table before : Code: Destination    Gateway        Genmask        Flags Metric Ref    Use Iface  U    0      0        0 eth0    U    1000  0        0 eth0      U    0      0        0 vpn_vpn        UG    0      0        0 eth0 and after i add the route: Code:  U    0      0        0 eth0    U    1000  0        0 eth0      U    0      0        0 vpn_vpn      U    0      0        0 vpn_vpn here's the virtual network adapter configuration : Code: ifconfig vpn_vpn vpn_vpn  Link encap:Ethernet  HWaddr 00:ac:55:bc:9e:bf            inet addr:  Bcast:  Mask:           inet6 addr: fe80::2ac:55ff:febc:9ebf/64 Scope:Link           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1           RX packets:34625 errors:0 dropped:0 overruns:0 frame:0           TX packets:298 errors:0 dropped:0 overruns:0 carrier:0           collisions:0 txqueuelen:500           RX bytes:3176333 (3.1 MB)  TX bytes:16090 (16.0 KB) i installed the same VPN client on windows XP and it's working like a charm. how can this be fixed (HowTos)