Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

modem dialin problem

Hi,

Hope you can help me with this, Im stuck.

I have a 2500 router with several external modems (US Robotics 56k) connected over asynch cables. the line config is setup to autocommand telnet to a backend server.

When I attempt to dial in, whichever modem answers, it seems to pick up the call, but then it drops almost immediately. The router log shows the same debug message each time:

Jun 18 14:40:20.691: tty1: Modem: HANGUP->IDLE

Jun 18 14:40:22.031: TTY1: Line reset by "Virtual Exec"

Jun 18 14:40:22.031: TTY1: Modem: IDLE->HANGUP

Jun 18 14:40:22.035: TTY1: destroy timer type 0

Jun 18 14:40:22.035: TTY1: destroy timer type 1

Jun 18 14:40:22.039: TTY1: destroy timer type 3

Jun 18 14:40:22.039: TTY1: destroy timer type 4

Jun 18 14:40:22.039: TTY1: destroy timer type 2

Jun 18 14:40:22.727: TTY1: dropping DTR, hanging up

Jun 18 14:40:22.727: tty1: Modem: HANGUP->IDLE

Jun 18 14:40:24.764: TTY1: restoring DTR

Jun 18 14:41:48.646: TTY1: Line reset by "Virtual Exec"

router config:

version 12.0

service timestamps debug datetime msec

service timestamps log datetime msec

service password-encryption

!

hostname R1

!

logging buffered 50000 debugging

aaa new-model

aaa authentication login default local

aaa authentication login no_user enable

aaa authentication login noaut none

aaa authentication login noprompt none

enable secret 5 <removed>

!

username test password 7 <removed>

ip subnet-zero

clock timezone GMT 0

!

!

!

interface Ethernet0

ip address x.x.x.x 255.255.255.0

no ip directed-broadcast

no ip mroute-cache

!

interface Serial0

no ip address

no ip directed-broadcast

no ip mroute-cache

shutdown

no fair-queue

!

interface Serial1

no ip address

no ip directed-broadcast

no ip mroute-cache

shutdown

!

ip classless

ip route 0.0.0.0 0.0.0.0 x.x.x.x

!

!

line con 0

transport input none

line 1

no exec-banner

exec-timeout 0 0

no activation-character

autoselect during-login

session-limit 1

no vacant-message

login authentication noaut

modem Dialin

autocommand telnet x.x.x.x 3001 /noecho

terminal-type edit

exec-character-bits 8

special-character-bits 8

transport preferred telnet

transport input all

escape-character BREAK

stopbits 1

flowcontrol hardware

line 2

no exec-banner

exec-timeout 0 0

no activation-character

autoselect during-login

session-limit 1

no vacant-message

login authentication noaut

modem Dialin

autocommand telnet x.x.x.x 3000 /noecho

terminal-type edit

exec-character-bits 8

special-character-bits 8

transport preferred telnet

transport input all

escape-character BREAK

telnet transparent

stopbits 1

flowcontrol hardware

line aux 0

login authentication no_user

line vty 0 4

password 7 <removed>

end

3 REPLIES

Re: modem dialin problem

Hi,

On a similar occassion wherein I was trying to get Aux Port configured for Remote Dialin (for exec access and not for data) I tried almost 4 USR modems and everytime all the modems would get stuck at the handshake and never be able to complete the process.

However when I changed the modem to a simple make and model, it did work!

I guess its a problem with USR, have you ever tried with some other brand?

Kind Regards,

Wilson Samuel

Re: modem dialin problem

It may be a problem with the dip switch setting in your USR modem.

Try setting dip switches 1, 3 & 8 down and other ones up or 3, 7 & 8 down and others up. I have used one of this settings effectively in the past.

Let us know if that helps.

HTH

Sundar

New Member

Re: modem dialin problem

Unfortunately this modem (USR 56k fax modem) seems to have no dip switches, not externally anyway. Unless there are dip switches inside the case on the main circuit board.

I will source another modem and try that.

thanks,

146
Views
0
Helpful
3
Replies