Question

Dialout from cisco to windows

Asked by: federicotrabant

Hi,

I need to connect (dial out ) from a cisco 3640 with a ISDN PRI to Windows (W2k) machines with ISDN modem and RAS.

We try a lot of different configuration but we always were unable to establish a ppp connection

here is an extract of config that use bidirectional CHAP

interface Dialer9
 description TEST
 ip address 172.16.10.46 255.255.255.0
 encapsulation ppp
 dialer pool 1
 dialer remote-name IT0152
 dialer string xxxxxxx

 dialer-group 1
 no cdp enable
 ppp authentication chap


We try also with PAP but again without success

 

interface Dialer9
 description TEST
 ip address 172.16.10.46 255.255.255.0
 encapsulation ppp
 dialer pool 1
 dialer string XXXXXXXX
 dialer-group 1
 no cdp enable
 ppp pap sent-username dialin password 7 XXX


This last configuration in particular report an access denied windows error (but user "dialin" is enabled and valid)
We uderstand that callin / callout option help to use a single way authentication (as windows actually does) but sample are quite unclear again.

Up to now we didn't find any sample in cisco that  show a template for this configuration, and even Microsoft help does't help

So how we can resolve the problem (a sample config) and /or better understand what is wrong ?

Question is urgent














 

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Asked On
2005-01-14 at 07:33:52ID21274599
Tags

cisco

,

dialout

,

pri

,

ppp

Topic

Network Routers

Participating Experts
5
Points
500
Comments
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Answers

 

by: srw134Posted on 2005-01-14 at 09:01:58ID: 13045976

If you have a CCO login check out this page:

http://www.cisco.com/en/US/partner/products/hw/routers/ps274/products_configuration_example09186a0080094691.shtml

if you don't I will post the page publically, it is a page in reference to configuring a 3600 for T1 PRI dialup.

-sean

 

by: federicotrabantPosted on 2005-01-14 at 09:28:47ID: 13046348

srw134
Thanks, but unusefull. even the troubleshooter document... actually I haven't found any sample of a cal placed by router and answered by windows....  

 

 

by: JFrederick29Posted on 2005-01-14 at 09:58:56ID: 13046735

Try adding "ppp authentication pap callin" to your dialer interface.  This will only require the router to authenticate to Windows and not vice versa.

A couple commands that would also be helpful to see what exactly is happening:

debug ppp authentication
debug ppp negotiation

 

by: mikebernhardtPosted on 2005-01-14 at 12:18:21ID: 13048237

I'd recommend staying with chap.

Now, how is your router getting the usernames and passwords to use for authentication when it dials? The remote-name doesn't do it. What that does is to check if the remote host has that name- if it doesn't, it drops the call. I would remove that line because if the server reports it's name is a bit differently (i.e. IT0152.DOMAIN) the router will drop the call without going further.

We don't see the rest of your config, but barring something else already in place I would add the lines
interface Dialer9
ppp chap hostname xxx
ppp chap password xxx

That will tell the router to send those bits to the server for authentication.

And you also need to add the hostname and password of the server so it can authenticate to the router.
config t
username xxx password xxx

 

by: federicotrabantPosted on 2005-01-14 at 14:44:27ID: 13049837

JFrederick29:

i've  already activate debug trace for auth and negotiation but callin option is unclear what does it means?.. yes single direction auth but  why not "callout" ? (difference etween callin and callout option really unknown). In any case as described I tryed both witout success

mikebernhardt:
we try using pap because of unsuccessfull chap configuration..... I know the difference, but in this moment is more importat to have a solution rather than optimal (or most secure)....

regarding "ppp chap hostname"  I will try and let you know  but the last step of your comment  is quite unclear (you also need to add hsotname and password of the server...). IMHO Windows Host Name doesn't have any password associated .... and I don't think that is possible to specify a passwrd for the windows host...   this is the reason for callin/collout  command.

Thanks to all


 

by: holger12345Posted on 2005-01-15 at 13:24:54ID: 13054584

Try configuring ms-chap instead of chap (if the option is available)

Microsoft has implemented a proprietary chap-version (to keep others out of ther net?) .. so perhaps you'll have to connnect with their own protocol or you have to use PAP instead (as this isn't MS-PAP !!)
Possibly the other way works too - if it's possible to tell MS-RAS to use plain chap ...  but i don't think so ;-)

Here's a bit of lecture...
http://www.cisco.com/en/US/products/sw/iosswrel/ps1826/products_feature_guide09186a0080080ed0.html

cheers Holger

 

by: federicotrabantPosted on 2005-01-15 at 15:52:17ID: 13055120

Holger:
Thanks, I 'll try on monday and let you know

 

by: fullermsPosted on 2005-03-09 at 01:32:56ID: 13494222

Can you post the a few lines from the debug output? Suggest that you test the link without authentication first. Then you can isolate the problem by enabling authentication at one end at a time.

20120131-EE-VQP-002

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