Why is the CISCO ASA not allowing traffic from the router behind it?

Question

Cisco

Good day, there is such a situation. It costs ASA 5505, followed by 2801. If you stick a regular client to the ace (to the inside interface), then the traffic goes to the external (outside) network. But if you tuck 2801 in, and even write 0.0.0.0 0.0.0.0 asa_inside_ip on it, then the traffic does not pass (where asa_inside_ip is the inside interface, it is also vlan 1).