| Author |
AUX and an external modem
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| popdevil 2004-04-06, 12:22 pm |
| I have attached an external modem to the AUX port of my 2524 router. I have all the IOS commands but for some reason the IOS is unable to find the modem. I have a rolled cable plugging into the back of a 7 pin serial connecter which plugs into the back of the modem. I believe the 7 pin connecter is causing the issue but I'm not sure.
Any ideas?
Thanks | |
| Yankee 2004-04-06, 8:03 pm |
| I'm sure you mean a 25 pin connector on modem and need a 9600 baud connection hard set on some modems.
Yankee | |
| popdevil 2004-04-06, 10:27 pm |
| The serial port on the back of the modem is 25 pin but I believe only 8 are required. The 25-Pin Male to 8-Wire RJ45 is what I just got but still having issues with the IOS seeing any modem. I did the debug conmodem and then modem autoconfigure discovery and it can't find the modem. Maybe I need a certain brand name modem? | |
| Yankee 2004-04-07, 6:06 am |
| Don't think you will see the modem. Aux port is generally used for remote access to dial into the router for troubleshooting. If you want users to dial into your network you need an async interface and octopus cable.
Yankee | |
| popdevil 2004-04-07, 7:09 am |
| Just want to dial into the router for troubleshooting issues. Not trying to give users access via a modem. (of course this is a hands on project for me rather then a real need). | |
| Yankee 2004-04-07, 12:13 pm |
| Just configure your aux0 basically like this though some commands may be default in some IOSs:
line aux 0
modem dialin
autobaud
transport preferred none
login authentication default
password
!
Then you may or may not need to hard set your modem to 9600 baud. Most will negotiate well by themselves, but have seen some that are stubborn.
Yankee | |
| 2lazybutsmart 2004-04-07, 12:46 pm |
| popdevil: I've had nightmares (and daymares  ) with AUX ports and modems. And this is how I've solved it many times.
First, as Yankee said, you gotta have the modem and AUX port to communicate with the following properties
Speed: 115200 (this is recommended, because it's the highest speed both the AUX and modem can use)
Partiy: none
flowcontrol: none
the rest depends on what you want the router to do with sessions. but don't forget one thing, you have to use the "modem autoconfigure discovery" command at the line 0 global configuration mode. once you type in this command, the "AA" light on your modem will come on. This means the modem is ready to answer calls "for" your router.
Hope it helps.
\2lbs. | |
| popdevil 2004-04-07, 1:08 pm |
| Ah, each time I did the modem autoconfigure discovery I did it from the LINE 1 because the show line tells me AUX 1 even though I type line aux 0 to set up the aux port.
I've been using...
config t
int line 1
modem inout
speed 38400 (it wouldn't take 115200)
transport input all
flowcontrol hardware
login
password *****
I would then use...
config t
int line 1
modem autoconfigure discovery
..of course it wouldn't find the modem.
I'll try Yankee's options and 2lazybutsmart's suggestion to autoconfigure on line 0 tonight
Thanks | |
| popdevil 2004-04-07, 8:55 pm |
| I wanted to say I got the modem to work. Feel good and bad really.
Feel good because each of the items I was doing was the right things to do. I feel bad because all of this time I spent on this and the darn cable was the issue. I decided to use the cable to go though the console and when that didn't work I switched cables and bam! The modem started lighting up like a Christmas tree. I was able to remote in via the modem.
Now have to read up on a little more security measures. 
Thanks to each person that posted suggestions. | |
| Yankee 2004-04-08, 4:34 am |
| doh...I'm sorry I should have mentioned that in my earlier post.
me sorry,
Yankee | |
| popdevil 2004-04-08, 7:04 am |
| I should have checked that first thing. That's trouble shooting 101. |
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