From: Ricky Martin (rickycool@gmail.com)
Date: Fri Apr 22 2005 - 05:51:24 GMT-3
Hi,
Thanx for the input Lee. My config didn't start to work after i
implemented the callback feature. I did test it before that and it was
working fine. I guess i would do the config again and test it. Thanx
for checking my config. I though i had missed something there.
Cheers
Ricky
On 4/22/05, Lee Donald <Lee.Donald@t-systems.co.uk> wrote:
> Ricky,
>
> A good troubleshooting method for ISDN is to test that it's working each
> step of the way.
>
> For instance, perform a test call or ping in this case, when you have the
> bare minimum config like
>
> interface BRI0/0
> ip address 167.3.45.4 255.255.255.0
> encapsulation ppp
> dialer map ip 167.3.45.5 name Rack3R5 broadcast 5272035
> dialer-group 1
> isdn switch-type basic-ni
> isdn spid1 5272034
>
> After which, add each bit of config at a time testing connectivity each time
> and put the authentication on last.
>
> Apart from which, your config might not be wrong, I've seen ISDN not work
> when the config is perfect ! Reboot the router and everything works, explain
> that !!
>
> Try that methodology.
>
> Regards
>
> Lee.
>
> -----Original Message-----
> From: Ricky Martin [mailto:rickycool@gmail.com]
> Sent: 22 April 2005 09:20
> To: Cisco certification
> Subject: PPP callback
>
> This seemed to be simple at the start. But i am doing my lab now and i
> am not able to get this thing working. Maybe i am missing something.
> Could u guys spot whats wrong with the config
>
> R4--ISDN---R5
>
> 1.legacy ISDN DDR between R4 and R5
> 2.Intresting traffic is icmp ping
> 3.idle timeoute is 60 either
> 4.ISDN calls should be originated from R4. configure your network so
> that when R5 calls R4, R4 initiates PPP callback
> 5.To ensure the authenticity of the device which calls R5 back,
> configure your network so that R5 issues a PPP authentication
> challenge after receiving back
> 6.R4 should respond to R5's challege with the username ROUTER4 and a
> hash value of the password CISCO
> 7.R5 should not issue this authentication challenge when it is calling R4
>
> My config
>
> R4
>
> username Rack3R5 password 0 CISCO
>
> interface BRI0/0
> ip address 167.3.45.4 255.255.255.0
> ip router isis
> encapsulation ppp
> dialer idle-timeout 60 either
> dialer map ip 167.3.45.5 name Rack3R5 class CALLBACK broadcast 5272035
> dialer callback-secure
> dialer-group 1
> isdn switch-type basic-ni
> isdn spid1 5272034
> ppp callback accept
> ppp authentication chap
> ppp chap hostname ROUTER4
> end
> map-class dialer CALLBACK
> dialer callback-server username
> !
> access-list 100 permit icmp any any echo
> dialer-list 1 protocol ip list 100
> !
> R5
>
> username ROUTER4 password 0 CISCO
>
> interface BRI0/0
> ip address 167.3.45.5 255.255.255.0
> ip router isis
> encapsulation ppp
> dialer idle-timeout 60
> dialer map ip 167.3.45.4 name ROUTER4 broadcast 5272034
> dialer-group 1
> isdn switch-type basic-ni
> isdn spid1 5272035
> ppp callback request
> ppp authentication chap callin
> !access-list 100 permit icmp any any echo
> dialer-list 1 protocol ip list 100
> !
>
> The error i get is authentication failure
>
> Rack3R4#ping 167.3.45.5
>
> Type escape sequence to abort.
> Sending 5, 100-byte ICMP Echos to 167.3.45.5, timeout is 2 seconds:
> ..
> *Mar 1 00:36:15.213: %LINK-3-UPDOWN: Interface BRI0/0:1, changed state to up
> *Mar 1 00:36:15.221: BR0/0:1 PPP: Using dialer call direction
> *Mar 1 00:36:15.221: BR0/0:1 PPP: Treating connection as a callout
> *Mar 1 00:36:15.221: BR0/0:1 PPP: Authorization NOT required
> *Mar 1 00:36:15.241: BR0/0:1 CHAP: O CHALLENGE id 9 len 28 from "ROUTER4"
> *Mar 1 00:36:15.253: BR0/0:1 CHAP: I CHALLENGE id 7 len 28 from "Rack3R5"
> *Mar 1 00:36:15.257: BR0/0:1 CHAP: Using hostname from interface CHAP
> *Mar 1 00:36:15.257: BR0/0:1 CHAP: Using password from AAA
> *Mar 1 00:36:15.257: BR0/0:1 CHAP: O RESPONSE id 7 len 28 from "ROUTER4"
> *Mar 1 00:36:15.281: BR0/0:1 CHAP: I FAILURE id 7 len 25 msg is
> "Authentication
> failed"
> *Mar 1 00:36:15.337: %ISDN-6-CONNECT: Interface BRI0/0:1 is now connected to
> 52
> 72035 .
> *Mar 1 00:36:15.337: %LINK-3-UPDOWN: Interface BRI0/0:1, changed state to
> down.
> .
> Success rate is 0 percent (0/5)
> Rack3R4#
>
> TIA for any input
> Ricky
>
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