RE: (Re): Re: ISDN's Dialer-map Question...

From: Gregory W. Posey Jr. (gposey@uaes.org)
Date: Tue Aug 26 2003 - 01:02:54 GMT-3

Did you do a bdebug ppp authenticationb to verify that CHAP was occurring?
Just wondering if therebs anything obvious that webre missing.

Thank you,
Greg Posey Jr.
CCIE #7981
CSS1, CCSE
M.S. EE
-----Original Message-----
From: CB0B3C+ [mailto:wwwjjang@chol.com]
Sent: Monday, August 25, 2003 5:40 PM
To: Gregory W. Posey Jr.; wwwjjang@chol.com
Cc: ccielab@groupstudy.com
Subject: (Re): Re: ISDN's Dialer-map Question...

Hi..George..
Thanks for your kind reply..

when i add a "ppp authentication chap" on both sodes..
But, The results is same unfortunately..^^;;;..

Is there any other method???

Thanks..
----------
> My answer
> ----------
 R1>

 username R2 password 0 cisco
 !
 interface Serial0
  backup interface BRI0 **
  ip address 2.2.2.1 255.255.255.0

 interface BRI0
  ip address 1.1.1.1 255.255.255.0
  encapsulation ppp
  ppp authentication chap ***
  dialer map ip 1.1.1.2 name R2 broadcast 2222222 **
  dialer-group 1
  isdn switch-type basic-5ess
 !
 dialer-list 1 protocol ip permit
 R2>

 username R1 password 0 cisco
 !
 interface Serial0
  ip address 2.2.2.2 255.255.255.0

 interface BRI0
  ip address 1.1.1.2 255.255.255.0
  encapsulation ppp
  ppp authentication chap ***
  dialer map ip 1.1.1.1 name R1 broadcast ***
  dialer-group 1
  isdn switch-type basic-5ess
 !
 dialer-list 1 protocol ip permit

--- Original Message ---
k34k8l4(From): "Gregory W. Posey Jr." gposey@uaes.org
k0k
l4(To): wwwjjang@chol.com
k34k8l<l (Date): Mon, 25 Aug 2003 15:16:19 -0400
l k*)(Subject): Re: ISDN's Dialer-map Question...

I believe the problem you have is the fact that you did NOT configure PPP
authentication. Without authentication, or caller ID (some way to identify
who the call is coming from), R2 will initiate a 2nd call so that it can
respond to the ping.

If you configure ppp authentication on both routers, then R2 will know that
it can respond to the ping on the same B channel that is already up (thus
you can REMOVE the dialer string from R2's dialer map... as a matter of
fact, I'm pretty sure you don't need a dialer map on R2 AT ALL).

I hope this helps.

Thank you,
Greg Posey Jr.
CCIE #7981
CSS1, CCSE
M.S. EE

> -----Original Message-----
> From: wwwjjang@chol.com [mailto:wwwjjang@chol.com]
> Sent: Monday, August 25, 2003 10:57 AM
> To: ccielab@groupstudy.com
> Subject: ISDN's Dialer-map Question...
>
>
> Hi..Everyone..
>
> I'm trying to test a DDR...
> and i have a question about Dialer-map..
>
> Does Who know the answer ????
>
> Thanks..
>
> ---------
> Diagram
> ----------
>
> R1-(bri0 1.1.1.1)--ISDN--(bri0 1.1.1.2)--R2
> | |
> S0(2.2.2.1)-------------------------S0(2.2.2.2)
>
> ---------
> Question
> ---------
> -Configure DDR on R1 & R2 so the ISDN-link only comes up if R1's
S0-interface goes down. -Only R1 should initate the call !!!
>
> ----------
> My answer
> ----------
> R1>
>
> username R2 password 0 cisco
> !
> interface Serial0
> backup interface BRI0 **
> ip address 2.2.2.1 255.255.255.0
>
> interface BRI0
> ip address 1.1.1.1 255.255.255.0
> encapsulation ppp
> dialer map ip 1.1.1.2 name R2 broadcast 2222222 ** dialer-group 1 isdn
switch-type basic-5ess cdapi buffers regular 0 cdapi buffers raw 0 cdapi
buffers large 0 ! dialer-list 1 protocol ip permit
>
>
> R2>
>
> username R1 password 0 cisco
> !
> interface Serial0
> ip address 2.2.2.2 255.255.255.0
>
> interface BRI0
> ip address 1.1.1.2 255.255.255.0
> encapsulation ppp
> dialer map ip 1.1.1.1 name R1 broadcast ***
> dialer-group 1
> isdn switch-type basic-5ess
> cdapi buffers regular 0
> cdapi buffers raw 0
> cdapi buffers large 0
> !
> dialer-list 1 protocol ip permit
>
> =>Because The question needs that Only R1 should initate the call,
> So I omitted the Dialsting#(1111111) of R1 in the Dialer-map of R2's Bri0
> (dialer map ip 1.1.1.1 name R1 broadcast ***)
> =>If I shut down the S0 of R1, The Bri-link between R1 & R2 is UP ..
> But When i ping the R2's BRI0(1.1.1.2) with a source R1's Bri0(1.1.1.1),
> It failed !!
> =>But When i add a Dial string# in R2 such as "dialer map ip 1.1.1.1 name R1
> broadcast 1111111", The ping is O.K!!!
> =>My Question is that I must always configure Dial sting # in R1 & R2's
BRI0
> ??.
> and if i do it, Can R2 also intiate the call ??
> =>So The Question,"Only R1 should initate the call " has no meaning !!!
>
> How can i fix the problm ????
> Help me..
>
> I'm sorry for my poor English..
>
>
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