cisco intervlan routing 2801 router & 2950 catalyst

Hi everyone;
im trying to setting up intervlan routing using a cisco 2801 and a 2950 switch.
In the router configuration i put some subin matching the vlan number.the first subinf belogs to native and is setting up as vlan 1, dot1q 1.
In the switch i configured one trunk port, and 3 ports asigned to vlan 1, vlan 2,vlan 3.
from the router i can ping to the pcs in the switch but no between pcs or subinterfaces.
no routing protocol (i test it but don?t work)
no acls
my ios is ipbase.where can?t route between pcs?
thanks & excuse my english