Pixboy,
You can apply the access list in both directions:
int ser 3/0.1
access-group 101 in
access-group 101 out
int ser 3/1.1
access-group 101 in
access-group 101 out
Or you could apply the "in" on the other interfaces on the router (fa 0/0, etc).
Are you running cef? You want...