用路由器的f0/1口连接adsl f0/0解交换机，不能成功，求教

fansBSD

用路由器的f0/1口连接adsl f0/0解交换机。\r\n\r\nBDCOM 2621路由器，下列配置，但不能实现PPPOE自动拨号。\r\n\r\n不知为何，求教中。\r\n\r\n!\r\n\r\ninterface Dialer1\r\n\r\n ip address negotiated\r\n\r\n ip mtu 1492\r\n\r\n\r\n no ip directed-broadcast\r\n\r\n ppp pap sent-username 8888 888\r\n\r\n ip nat outside\r\n\r\n!\r\n\r\ninterface Ethernet1/1\r\n\r\n ip address 192.168.20.1 255.255.255.0\r\n\r\n no ip directed-broadcast\r\n\r\n ip nat inside\r\n\r\n!\r\n\r\ninterface Ethernet2/0\r\n\r\n no ip address\r\n\r\n no ip directed-broadcast\r\n\r\n pppoe-client Dialer1\r\n\r\n!\r\n\r\n!\r\n\r\nip route default Dialer1\r\n\r\n!\r\n\r\nip access-list standard 1\r\n\r\n permit 192.168.0.0 255.255.0.0\r\n\r\n!\r\n\r\n!\r\n\r\n!\r\n\r\nip nat inside source list 1 interface Dialer1\r\n\r\n!

fansBSD

那位大哥，帮忙说明一下好吗！