From: eward15@juno.com
Date: Wed May 11 2005 - 13:29:41 GMT-3
Sean,
Here is the post from Marvin:
http://www.groupstudy.com/archives/ccielab/200503/msg00607.html
Eugene Ward
---------------------------------------------------------------------------
Hi Tim,
Yep, thanks to the reply from Eugene, I now found your posts from February.
Looks like one of your posts received replies, the other didn't. I don't
see anything from Marvin in the archives on this subject - perhaps a private
email train? It's weird, I see your initial post, but not your replies to
Vijaybhasker. Unfortunately, because the Search is screwed up for
Groupstudy, have to do a month by month search. Doing a full search of all
posts never finds anything later than October of last year.
http://www.groupstudy.com/archives/ccielab/200502/threads.html#00720
I also found Simon's similar post from March:
http://www.groupstudy.com/archives/ccielab/200503/threads.html#00594
And I only found a brief mention by Vijaybhasker of the calling router. I
wasn't sure if this was the conclusion - that only the calling router
utilizes this command.
Thanks,
Sean
----- Original Message -----
From: "ccie2be" <ccie2be@nyc.rr.com>
To: "'Sean C'" <Upp_and_Upp@hotmail.com>; "Group
Study"
<ccielab@groupstudy.com>
Cc: "marvin greenlee" <marvin@ccbootcamp.com>
Sent: Wednesday, May 11, 2005 10:59 AM
Subject: RE: Ways of Callback PPP/ISDN/Dialer
> Sean,
>
> This IS in the archives. I know because I had this conversation with
> Marvin
> Greenlee about 2 months ago.
>
> I believe the Called Router Waits but if you have access to 2 rtr's with
> isdn you can see for yourself by using debug ppp authen.
>
> HTH, Tim
>
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Sean
> C
> Sent: Wednesday, May 11, 2005 10:31 AM
> To: GroupStudy
> Subject: Re: Ways of Callback PPP/ISDN/Dialer
>
> Ok, just when I thought I stopped my little head from spinning, a person
> wrote
> to me offline and brought up a good PPP question that now has me baffled
> also.
> I tried Googling and searching the archives but nada... I found one
> vendor
> alluded to this in their own forum, but no real explanation for the
> solution.
>
> ppp chap wait: To specify that the router will not authenticate to a peer
> requesting Challenge Handshake Authentication Protocol (CHAP)
> authentication
> until after the peer has authenticated itself to the router, use the ppp
> chap
> wait command in interface configuration mode.
> http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123cgcr/sec
u
> r
> _r/sec_p1g.htm#wp1070281
>
> The perplexing part is that the doc says this command is enabled by
> default.
> So the question is if ppp chap wait is enabled by default and both
> routers'
> ints have this enabled, what makes the 2 routers finally authenticate
> properly? The doc makes it read as if both routers will play a game of
> chicken, waiting for the other side to be authenticated first before it
> allows
> itself to be authenticated. Since each router is waiting for the other
> side
> to be authenticated first, neither side will ever be authenticated.
> Arggh!!!
>
> Any suggestions/hints of advice would be appreciated....
> Sean
>
> ----- Original Message -----
> From: Sean C
> To: GroupStudy
> Sent: Tuesday, May 10, 2005 4:17 PM
> Subject: Ways of Callback PPP/ISDN/Dialer
>
>
> Hello,
>
> Just when I think I have the hang of something, I reread, I relab and my
> head is all (re)screwed up again. I'm trying to understand all the ways
> to
> utilize a callback function. From the perspective of the router that
> receives
> the initial call and then calls the original calling router back, I've
> found
> 3
> different methods:
>
> 1- dialer string class callback:
>
> http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123cgcr/dia
> l_r/dia_d1g.htm#wp1019588
> Used in conjunction with: dialer callback-server:
>
> http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123cgcr/dia
> l_r/dia_d1g.htm#wp1105126
> Used in conjunction with: ppp callback-accept:
>
> http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123cgcr/dia
> l_r/dia_n1g.htm#wp1134019
>
> If using this trio of commands, requires PPP authentication.
> Also, even though the doc says dialer callback-server is an interface
> command, I've only ever seen it applied under a map-class.
>
> 2- dialer caller callback
>
> http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123cgcr/dia
> l_r/dia_d1g.htm#wp1120901
> Does not require PPP authentication
>
> 3- isdn caller callback
>
> http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123cgcr/dia
> l_r/dia_i2g.htm#wp1052104
> I'm not sure if this requires PPP authentication, but my bet is that it
> doesn't (like dialer caller callback).
>
> Can anyone comment or offer any alternatives, corrections? As always,
> most
> appreciated,
> Sean
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