I tried with VPNC but its very slow.
I tested with vpnclient on other machine and it went fast.
It seems vpnclient connects very quickly. But when I installed it, it says:
Failed to make module "cisco_ipsec.ko"
I tested on two CentOS machine . In one of Centos machine it easily retrieved the directory /lib/modules/2.6.9-78.EL/build but amazingly in new Machine its build file linked to ../../lib/modules/2.6.9-78.EL/build
Any Idea ?