my diagram is
isp line---adsl router(dynamic ip)--- asa5505----vpntunnel---- asa5520(static ip)
i connected from ADSL to asa5505 so adsl local is 192.168.1.0 network and asa 5505 outside also the same network
so i need to configure site to site vpn between two asa ..
so i need to route any traffic on router or it will automatically route the vpn traffic in ADSL line side.