From: Larry Roberts (groupstudy@american-hero.com)
Date: Fri Jun 18 2004 - 10:48:32 GMT-3
Couple of things I see or would recommend trying.
1) I believe your ppp authentication chap callin should be on the server. (
at least with TACACS it should be )
2) remove the ip router isis and the clns dialer map. ( its extra
configurations..lets simplify)
3) on the server add "dialer enable-timeout 10" ( Im not on a router so
verify the format)
4) set both routers to have the same dialer idle-timeout.
Here are the values I typically use
dialer idle-timeout 30
dialer enable-timeout 10 ( on server only )
dialer hold-queue 20
I would strip down your configuration of anything unneccessary, and add it
back later.
I will be in a position to test in my lab this afternoon, so I will play
around with your configuration as well.
-----Original Message-----
From: Sharma, Mohit [mailto:mohit.sharma@hp.com]
Sent: Friday, June 18, 2004 4:02 AM
To: Larry Roberts
Cc: studygroup
Subject: RE: ISDN timers clash
Hi Larry,
Here are the configs,
I am not using any simulator, but real ISDN lines :)
Rack1R4#sh run int bri 0
Building configuration...
Current configuration : 469 bytes
!
interface BRI0
ip address 167.1.45.4 255.255.255.0
ip router isis
encapsulation ppp
dialer callback-secure
dialer idle-timeout 60
dialer map ip 167.1.45.5 name Rack1R5 class callback broadcast 230800
dialer map clns 49.3490.0001.0001.0005.00 name Rack1R5 class callback
broadcast 230800 dialer-group 1 isdn switch-type basic-net3 no peer
neighbor-route ppp callback permit ppp authentication chap ppp chap
hostname ROUTER4 end
-------------
Rack1R5#sh run int bri 0
Building configuration...
Current configuration : 370 bytes
!
interface BRI0
ip address 167.1.45.5 255.255.255.0
ip router isis
encapsulation ppp
dialer idle-timeout 0
dialer map ip 167.1.45.4 name ROUTER4 broadcast 237388 dialer map clns
49.3490.0001.0001.0004.00 name ROUTER4 broadcast 237388 dialer-group 1
isdn switch-type basic-net3 no peer neighbor-route ppp callback request
ppp authentication chap callin end
Rack1R5#
---------------
The dialer-list is configured to permit icmp so, a ping can bring up the
line.
I have played around with enable time-out on R4 and wait-for-carrier time in
R5 but in vain.
Thanks,
Mohit.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Larry Roberts
Sent: Friday, June 18, 2004 1:36 AM
To: Sharma, Mohit
Cc: studygroup
Subject: RE: ISDN timers clash
Can you post your ISDN configurations.
What ISDN sim are you using?
I had something similar with mine going on. I was doing TACACS callback, and
chap authentication via dialer interfaces. when I didn't do chap
authentication under the BRI interface as well as the dialer interfaces I
was getting this behavior.
I was also running into a problem with the simulator that upgrading the code
on fixed ( for the record it wasn't a simulator problem, but they adjusted
thier code to fix the problem on the routers.)
On Thu, 2004-06-17 at 12:16, Sharma, Mohit wrote:
> Hi All,
>
> Replying to my own mail.
> I really cant get this thing cleared up.
> The ppp callback is not working as intended- R5 calls R4, and R4 is
> only able to call R5 on channel2. as channel 1 is still busy freeing
> callback.
> ack1R5#sh isdn act
>
> ISDN ACTIVE CALLS
> ----------------------------------------------------------------------
> --
> --------
> Call Calling Called Remote Seconds Seconds Seconds
> Charges
> Type Number Number Name Used Left Idle
> Units/Currency
> ----------------------------------------------------------------------
> --
> --------
> Out 237340 35 24 35
0
>
> In ---N/A--- 230897 ROUTER4 27 32 27
>
> ----------------------------------------------------------------------
> --
> -
>
> On R4 is configured as a callback server and here is what I get on R4
> with debugs- Rack1R4#
> 00:30:06: BR0:1 PPP: Using dialer call direction
> 00:30:06: BR0:1 PPP: Treating connection as a callin
> 00:30:07: BR0:1 CHAP: Using alternate hostname ROUTER4
> 00:30:07: BR0:1 CHAP: O CHALLENGE id 7 len 28 from "ROUTER4"
> 00:30:07: BR0:1 CHAP: I RESPONSE id 7 len 28 from "Rack1R5"
> 00:30:07: BR0:1 CHAP: O SUCCESS id 7 len 4
> 00:30:07: BR0:1 DDR: callback to Rack1R5 already started
> 0:30:13: DDR: Callback timer expired
> 00:30:13: BR0 DDR: beginning callback to Rack1R5 230897
> 00:30:13: BR0 DDR: Attempting to dial 230897 Rack1R4#
> 00:30:15: %LINK-3-UPDOWN: Interface BRI0:2, changed state to up
> Rack1R4#
> 00:30:15: DDR: Freeing callback to Rack1R5 230897
> 00:30:15: BR0:2 PPP: Using dialer call direction
> 00:30:15: BR0:2 PPP: Treating connection as a callout
> 00:30:15: BR0:2 CHAP: Using alternate hostname ROUTER4
> 00:30:15: BR0:2 CHAP: O CHALLENGE id 3 len 28 from "ROUTER4"
> 00:30:15: BR0:2 CHAP: I CHALLENGE id 3 len 28 from "Rack1R5"
> 00:30:15: BR0:2 CHAP: Using alternate hostname ROUTER4
> 00:30:15: BR0:2 CHAP: O RESPONSE id 3 len 28 from "ROUTER4"
> 00:30:15: BR0:2 CHAP: I SUCCESS id 3 len 4
> 00:30:15: BR0:2 CHAP: I RESPONSE id 3 len 28 from "Rack1R5"
> 00:30:15: BR0:2 CHAP: O SUCCESS id 3 len 4
> 00:30:15: BR0:2 DDR: dialer protocol up
> ----------------------------------------------------------------------
> --
> ------
> According to the doc cd-
> """Router(config-if)# dialer enable-timeout seconds
> Configures the time to wait before initiating callback. ""
> SO I tried to set dialer wait-for-carrier-time 60 on R5 And dialer
> enable-timeout 120 on R4. But then the call from R5 on channel 1 lasts
> for 60 seconds and R4 still calls R5 on channel2.
> Can somebody please suggest what timers I should use on R4 and R5
> (the
> client) so that R4 WAITS before giving a callback to R5.
> PLEASE HELP.
> Many Thanks,
> Mohit.
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> Of Sharma, Mohit
> Sent: Wednesday, June 16, 2004 10:08 PM
> To: studygroup
> Subject: ISDN timers clash
>
> Hello All,
>
> I have seen in the labs that whenever I configure callback (ppp or
> dialer), the callback router always has a clash when calling back. The
> result is that the first channel is always trying to connect and the
> connection is always established on the second channel.
>
> Anybody can give a hint on whats going on??
>
> I think I have to play around with dialer enable timeout and some
> other values??
>
> But on the calling side or the caller??
>
> Thanks,
>
> Mohit.
>
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