I have a Cisco 3620 router with 4 fast ethernet, 2 serial ports and 1 ISDN BRI S/T. To connect to my ISP, I'm using an Aironet 340 Wireless Bridge, tunneled through Fast Ethernet 0/0 on router. Is that configuration correct? Because I'm paying 128 Kbps to get 64 Kbps to my ISP. Do I have to connect the Aironet to the router via serial ports?
Your router should direct all LAN traffic to your ISP. This is independent of the Aironet. Just put your access point on your LAN and gateway everything at the router. Configure the router to gateway at the ISP.