From: samccie2004@yahoo.co.uk
Date: Fri Jul 02 2004 - 13:25:57 GMT-3
Hi Brian
Thanks for the answer.
But would "ppp chap password" and "ppp chap username" combination provide
the right combination for R5 to accept?
Regards
Sam
PS: the more I ask now the less I will on Monday
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Brian McGahan
Sent: 02 July 2004 17:43
To: Mike Calhoon; samccie2004@yahoo.co.uk; studygroup
Subject: RE: IE lab 14 task 4.4-4.8
Sam,
R5 calls R4, R4 calls R5 back. R5 says "ppp authentication chap
callin", so R5 challenges R4 via CHAP. R4 receives the challenge from
R5, what does it do with it? How does it derive the hash value to
respond?
HTH,
Brian McGahan, CCIE #8593
bmcgahan@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987 x 705
Outside US: 775-826-4344 x 705
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> Mike Calhoon
> Sent: Friday, July 02, 2004 6:50 AM
> To: samccie2004@yahoo.co.uk; 'studygroup'
> Subject: RE: IE lab 14 task 4.4-4.8
>
> Sam,
>
> I see what you are saying. I am thinking it has to be there for the
> callback section. In the class map it is using "dialer
callback-server
> username", which if I remember correctly will only call back users if
the
> dial-in name matches what is in the router's database. I could be
wrong
> on
> that...perhaps authentication from R4 is not necessarily needed. I am
> sure
> someone else in the group can help clarify.
>
> Thanks,
> Mike
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> samccie2004@yahoo.co.uk
> Sent: Friday, July 02, 2004 7:25 AM
> To: Mike Calhoon; 'studygroup'
> Subject: RE: IE lab 14 task 4.4-4.8
>
> I agree with ur explanation except for the part that says R4 is
> challenging
> R5 cos I cannot see it on the requirement. Is it implied anywhere ?
>
> If I break down the whole task, this is what I make of it:
>
> 4.4 R4 accept callback. R5 request callback.
> 4.5 R4 must be secure callback server.
> 4.6 R5 challenges callers PPP CHAP.
> 4.7 R4 chap hostname ROUTER4 and matching username on R5.
> 4.8 R5 CHAP callin only
>
> So I still cannot see where R4 should challenge R5.
>
> TIA
>
> Sam
>
> -----Original Message-----
> From: Mike Calhoon [mailto:mcalhoon27@earthlink.net]
> Sent: 02 July 2004 13:13
> To: samccie2004@yahoo.co.uk; 'studygroup'
> Subject: RE: IE lab 14 task 4.4-4.8
>
>
> Hi Sam,
>
> R4 is configured to challenge R5 inbound and outbound, so it does need
the
> username there. You can tell because it has the "ppp authentication
chap"
> line in it, which tells the router to authenticate both ways. R5 does
not
> challenge R4 when it calls R4. You can tell because it has the "ppp
> authentication chap callin" line. When R4 authenticates R5 and
determines
> it is a callback request, it will hang up and call R5 back. Then R5
will
> authenticate R4 as "ROUTER4".
>
> Thanks,
> Mike
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> samccie2004@yahoo.co.uk
> Sent: Friday, July 02, 2004 3:58 AM
> To: studygroup
> Subject: IE lab 14 task 4.4-4.8
>
> Hi Group
>
> In R4, I cannot see why we have to configure username and password for
R5
> since R5 is not being challenged by R4.
>
> Is that necessary ?
>
> BTW I cannot test it cos my ISDN sim isgoing to the bin in 10 seconds.
>
> TIA
>
> Sam
>
>
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