vpn tunnel must always up

already established my ipsec vpn using dialup setup, my HQ was configured using public address and remotes sites using dynamic/public /private ip addresses. However the tunnel would only established if there was a traffic initiated from remote sites. What I want is the tunnel must be up all the time no matter no traffic coming from remotes sites HQ Phase1 Settings Keepalive frequency 10 (default) dead peer detection enabled Phase 2 Autokey Keep Alive enabled Remote Phase1 Settings Keepalive frequency 10 (default) dead peer detection enabled Phase 2 Autokey Keep Alive enabled Any inputs are highly appreciated :)