From: Matt Clancy (mclancy@wantec.com)
Date: Sun Feb 08 2004 - 17:02:55 GMT-3
Rich,
I believe this is a code issue. If you don't configure rotary groups
(with corresponding dialer interfaces), it won't work on 12.1(5)T9. I'm
not sure about later versions of code, but I'm positive about this one.
Matt
-----Original Message-----
From: rich doty [mailto:rich_doty@hotmail.com]
Sent: Sunday, February 08, 2004 1:29 PM
To: dmitry.volkov@rogers.com; patrick.basso@groupstudy.com
Cc: ccielab@groupstudy.com; security@groupstudy.com
Subject: RE: interesting traffic on server (isdn callback)
What's your opinion on Dialer Rotary group? Is this necessary on the
callback server? Dmitry Botokey's Practical Studies example shows it,
and so
do some examples on CCO. If it works without it, is it more correct to
configure dialer profiles on the server and the client?
Rich
>From: "Dmitry Volkov" <dmitry.volkov@rogers.com>
>Reply-To: "Dmitry Volkov" <dmitry.volkov@rogers.com>
>To: <patrick.basso@groupstudy.com>
>CC: <ccielab@groupstudy.com>, <security@groupstudy.com>
>Subject: RE: interesting traffic on server (isdn callback)
>Date: Sun, 8 Feb 2004 10:45:49 -0700
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>
>when idle time is not equal 0 it doesn't matter whether dialer-group
>configured (denying all IP) or not configured at all
>please note: I talk about server
>
>with regards to dialer-group on client when we have dialer watch
>configured - we don't need dialer-group because
>watched routes are "interesting" traffic, checked every idle period
(def
>120
>sec)
>
>if we have dialer group allowing some traffic which constantly resets
idle
>timeout - ISDN will stay UP as long as interesting traffic (other than
>watched route) is going through isdn.
>
>Dialer watch will still able to notice that Primary route is UP via
other
>interface
>00:48:32: DDR: Dialer Watch: watch-group = 1
>00:48:32: DDR: network 10.10.10.0/255.255.255.0 UP,
>00:48:32: DDR: primary UP
>but it will not disconnect call because of other interesting traffic
>defined
>with dialer list/group
>
>However my quest was more about psychology/intuition rather than
>technology
>:)
>
>When I asked to have callback ISDN backup scenario when client calls
>server,
>server gets dial string from AAA and calls back to client - Should I
config
>dialer group with proper acl on server (callback scenario) considering
that
>server is "capable" to initiate call
>and forget about the fact that server will disconnect call after idle
timer
>is expired.
>I.e. should server be "interesting traffic" aware and participate in
>maintenance of interesting traffic or it's really client's duty ?
>I have feeling that lab is graded based on exactly what they expect but
not
>on any working config not contradicting with requirements
>
>In well known CCO example
>http://www.cisco.com/en/US/tech/tk713/tk507/technologies_configuration_
examp
>le09186a00800946ff.shtml
>author configs idle timeout and dialer group on server. It doesn't make
>much
>sense for me for any type of isdn BACKUP situations because server's
>function to call back and since client did initiate call - because it
lost
>watched route or because of connected interface was down (or whatever
else
>backup situation) - it should be client's function when and why to
>disconnect call.
>Server doesn't have even dial string - it gets it from AAA during
callback
>only.
>The same time I agree that in normal remote access (not backup)
scenario it
>may be perfectly legitimate to have dialer group and idle > 0 on server
>
>just interesting to hear diff opinions...
>
>Thanks,
>Dmitry
>
> > -----Original Message-----
> > From: Michael Snyder [mailto:msnyder@revolutioncomputer.com]
> > Sent: Sunday, February 08, 2004 11:16 AM
> > To: ccielab@groupstudy.com
> > Cc: 'Dmitry Volkov'
> > Subject: RE: interesting traffic on server (isdn callback)
> >
> >
> > I've had problems without the dialer-group or at least a dialer
watch
> > commands in the bri configs. When I don't need it I normally put a
> > dialer-list 1 protocol ip deny.
> >
> > Is there a difference between not having, and denying everything
with
> > it?
> >
> > At one time I thought there was, and haven't reexamined it since.
> >
> >
> > BTW, someone posted the isdn rollover delay 1 command a few
> > weeks back.
> > Thank you. You would not believe how I fought with my damn routers
> > getting multiline dialback to work. I added that command and life
is
> > good.
> >
> > Speaking of timing with callback, what timing settings do you use?
> > Carrier wait of 2 on one side, and (can't think of it right
> > now) of 4 on
> > the other side?
> >
> >
> > -----Original Message-----
> > From: Dmitry Volkov [mailto:dmitry.volkov@rogers.com]
> > Sent: Sunday, February 08, 2004 9:28 AM
> > To: security@groupstudy.com
> > Subject: interesting traffic on server (isdn callback)
> >
> > Group,
> >
> > when we configure isdn callback - what is the common
> > sense/opinion about
> > "dialer-group" & "dialer idle-timeout" commands
> > on Server ?
> >
> > I'm asking NOT about real world but about different lab
> > exercises we all
> > doing in out test environment targeting to pass lab test.
> >
> > My logic - since server usually doesn't suppose to call client (only
> > callback) so server doesn't need "dialer-group" at all and
> > need "dialer
> > idle-timeout 0"
> > It's duty of client to maintain / break call.
> >
> > Does anybody have different opinion / approach ?
> >
> > Thanks,
> > Dmitry
>
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