From: Jay Hennigan (jay@xxxxxxxx)
Date: Sat Oct 20 2001 - 17:38:04 GMT-3
On Sat, 20 Oct 2001, Chuck Church wrote:
> Anyone,
>
> I'm trying to setup DDR between 2 aux ports using USR modems and two
> phone lines. A 3Com NBX is providing the dial tone. My problem is the
> called router doesn't seem to recognize it's received a call. 'Sh dialer'
> says it's idle. I assume it's just a simple setting unique to analog
> modems. The important part of my configs is below.
I'm assuming that a 3Com NBX is a small PBC system of some type.
Does the called modem answer? Do they do the song of modems mating
and go silent?
Make sure your modem settings are for RTS/CTS/DTR normal, and try adding
the following to your config:
The async interface commands will allow routing protocols and set the
interface as a dedicated interface port as opposed to interactive access
to the router itself.
The aux line commands should allow the router to sense the carrier detect
and RTS/CTS modem lines to detect that the modem has answered and negotiated
a connection. As the best you'll do with analog modems is 33.6K async, the
hardware flow control is also needed with you4 38400 speed to prevent
overrunning the modem buffer during data transfer.
interface Async1
async dynamic routing
async mode dedicated
line aux 0
no exec
flowcontrol hardware
> ***R2****
> username r6 password 0 cisco
> !
> interface Async1
> ip address 10.0.0.1 255.255.255.252
> no ip directed-broadcast
> no ip directed-broadcast
> dialer in-band
> dialer map ip 10.0.0.2 name r6 broadcast 401
> dialer-group 1
> ppp authentication chap
> ppp chap password 7 05080F1C2243
> !
> dialer-list 1 protocol ip permit
> !
> !
> line aux 0
> modem InOut
> modem autoconfigure discovery
> speed 38400
>
> ***R6****
> username r2 password 0 cisco
> !
> interface Async1
> ip address 10.0.0.2 255.255.255.252
> no ip directed-broadcast
> encapsulation ppp
> dialer in-band
> dialer map ip 10.0.0.1 name r2 broadcast 400
> dialer hold-queue 100
> dialer-group 1
> !
> ip classless
> !
> dialer-list 1 protocol ip permit
> !
> !
> line con 0
> transport input none
> line aux 0
> modem InOut
> modem autoconfigure discovery
> speed 38400
-- Jay Hennigan - CCIE #7880 - Network Administration - jay@west.net NetLojix Communications, Inc. - http://www.netlojix.com/ WestNet: Connecting you to the planet. 805 884-6323
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