Use the pppoeControlPacket log to diagnose problems on your PPPoE interfaces.
log severity debug pppoeControlPacket
host1(config-if)#ip address 164.10.6.71 255.255.255.0 host1(config-if)#log severity debug pppoeControlPacket atm 10/0.1 host1:v0#DEBUG 07/25/2000 15:13:19 pppoeControlPacket (interface atm 10/0.1): PADI rx from 00-09-01-a0-00-2e DEBUG 07/25/2000 15:13:19 pppoeControlPacket (interface atm 10/0.1): PADO tx to 00-09-01-a0-00-2e DEBUG 07/25/2000 15:13:19 pppoeControlPacket (interface atm 10/0.1): PADR rx from 00-09-01-a0-00-2e DEBUG 07/25/2000 15:13:19 pppoeControlPacket (interface atm 10/0.1): PADS tx to 00-09-01-a0-00-2e, connection made using session id 3 on sub interface 1 RX-a0-00-2e:v0# RX-a0-00-2e:v0# RX-a0-00-2e:v0# RX-a0-00-2e:v0# RX-a0-00-2e:v0# RX-a0-00-2e:v0# RX-a0-00-2e:v0#config t Enter configuration commands, one per line. End with CNTL/Z. RX-a0-00-2e:v0(config)#interface atm 10/1.1.1 RX-a0-00-2e:v0(config-if)#ppp shut RX-a0-00-2e:v0(config-if)#DEBUG 07/25/2000 15:13:38 pppoeControlPacket (interface atm 10/0.1): PADT rx from 00-09-01-a0-00-2e RX-a0-00-2e:v0(config-if)# RX-a0-00-2e:v0(config-if)#no ppp shut RX-a0-00-2e:v0(config-if)#pppoe test RX-a0-00-2e:v0(config-if)#DEBUG 07/25/2000 15:13:49 pppoeControlPacket (interface atm 10/0.1): PADI rx from 00-09-01-a0-00-2e DEBUG 07/25/2000 15:13:49 pppoeControlPacket (interface atm 10/0.1): PADO tx to 00-09-01-a0-00-2e DEBUG 07/25/2000 15:13:49 pppoeControlPacket (interface atm 10/0.1): PADR rx from 00-09-01-a0-00-2e DEBUG 07/25/2000 15:13:49 pppoeControlPacket (interface atm 10/0.1): PADS tx to 00-09-01-a0-00-2e, connection made using session id 4 on sub interface 1 RX-a0-00-2e:v0(config-if)# RX-a0-00-2e:v0(config-if)#exit