Cisco 1721 ATM nightmare

Hi I am trying to get a 1721 atm interface to work with BT and I am not having much luck....... all I am getting is the Vi3 protocol not coming up and a continuous debug about "PPP: Authorization NOT required"

Here's the relavant bits of config any help gratfully received:

Current configuration : 4378 bytes ! version 12.2 service timestamps debug datetime msec service timestamps log datetime msec service password-encryption ! hostname hostname ! logging queue-limit 100 enable secret 5 password ! username root password 7 password aaa new-model ! ! aaa authentication login VTY local-case aaa session-id common ip subnet-zero no ip source-route ! ! ip domain name .com ! no ip bootp server ip inspect max-incomplete low 200 ip inspect max-incomplete high 400 ip inspect one-minute low 50 ip inspect one-minute high 100 ip inspect name OUTBOUNDTRAFFIC tcp ip inspect name OUTBOUNDTRAFFIC udp ip inspect name OUTBOUNDTRAFFIC ftp ip inspect name OUTBOUNDTRAFFIC icmp ip audit notify log ip audit po max-events 100 ! ! !! interface ATM0 ip address dhcp ip mtu 1500 no atm ilmi-keepalive pvc 0/35 encapsulation aal5mux ppp dialer dialer pool-member 1 ! dsl operating-mode auto ! interface Ethernet0 no ip address shutdown ! interface FastEthernet0 ip address 10.x.x.x 255.255.255.0 ip nat inside speed auto ! interface Dialer1 ip address 217.x.x.x 255.255.255.248 ip nat outside encapsulation ppp dialer pool 1 dialer-group 1 ppp authentication chap callout ppp chap hostname hostname ppp chap password 7 password ! ! ip nat inside source list NAT2 interface Dialer1 overload ip classless ip route 0.0.0.0 0.0.0.0 Dialer1 no ip http server no ip http secure-server ! ! ! ! dialer-list 1 protocol ip permit !

line con 0 line aux 0 line vty 0 4 access-class TELNETSSH in login authentication VTY transport input telnet ssh ! no scheduler allocate end

Interface IP-Address OK? Method Status Protocol

Virtual-Access3 unassigned YES unset up down ATM0 unassigned YES manual up up ATM0.1 unassigned YES unset up up Dialer0 217.x.x.x YES manual up up

Well for starters you seem to have the wrong VPI/VCI.

You want something like these on the ATM/dialer

interface ATM0 no ip address no ip mroute-cache no atm ilmi-keepalive pvc 0/38 encapsulation aal5mux ppp dialer dialer pool-member 1 dsl operating-mode auto ! !

interface Dialer1 description we.keep.note.of.address.here ip address negotiated ip nat outside ip virtual-reassembly encapsulation ppp dialer pool 1 dialer-group 1 no cdp enable ppp authentication chap callin ppp chap hostname hostname ppp chap password 7 password

Even with a static IP we let it negotiate.

Obviously you need to define the ACL for NAT or maybe you cut it out?

Thanks for help it was the VPI/VCI