Cisco Compatible vpn (vpnc) ubuntu 18.04

I installed Cisco Compatible vpn using following commnand:

sudo apt install vpnc network-manager-vpnc network-manager-vpnc-gnome 

I have set my credentials and tried to connect, but I can only reach a few sites available from the vpn. If I try connecting using Cisco vpn client on windows, the websites work.

Can you help me figure out what the problem is? How can I troubleshoot this?