CISCO 2511 - Dialin access / DTR

Discussion in 'Cisco' started by robert mcfadzien, Jul 15, 2003.

  1. hi

    i have a 2511 access server with 8 rockwell based external modems
    connected for dialin access.

    When initialising the modems via a chat-script, they initialiase ok
    but the DTR is not restored. dialing into each modem the first time,
    the PPP authetication will fail (no authentication is performed).

    After dialing into each modem once, the debug modem displays the DTR
    being restored:

    ..Jul 15 06:38:16.541 UTC: TTY3: restoring DTR

    Once its restored, authentication works ok.

    If I have a chat-script execute after each session (script reset), the
    modems lose DTR after each call, requiring a connection before
    restoring.

    below are parts of my config, any help would be appreciated.

    isco Internetwork Operating System Software
    IOS (tm) 2500 Software (C2500-I-L), Version 12.0(10), RELEASE SOFTWARE
    (fc1)
    Copyright (c) 1986-2000 by cisco Systems, Inc.
    Compiled Mon 20-Mar-00 21:43 by phanguye
    Image text-base: 0x0302F35C, data-base: 0x00001000

    ROM: System Bootstrap, Version 11.0(10c), SOFTWARE
    BOOTFLASH: 3000 Bootstrap Software (IGS-BOOT-R), Version 11.0(10c),
    RELEASE SOFTWARE (fc1)

    ait-dama uptime is 1 week, 4 days, 8 hours, 27 minutes
    System restarted by reload at 22:22:34 UTC Thu Jul 3 2003
    System image file is "flash:c2500-i-l.120-10.bin"

    cisco 2511 (68030) processor (revision M) with 6144K/2048K bytes of
    memory.
    Processor board ID 20610076, with hardware revision 00000000
    Bridging software.
    X.25 software, Version 3.0.0.
    1 Ethernet/IEEE 802.3 interface(s)
    2 Serial network interface(s)
    16 terminal line(s)
    32K bytes of non-volatile configuration memory.
    8192K bytes of processor board System flash (Read ONLY)

    Configuration register is 0x2102



    interface Group-Async1
    ip unnumbered Ethernet0
    no ip directed-broadcast
    encapsulation ppp
    ip tcp header-compression passive
    async mode dedicated
    peer default ip address pool setup_pool
    no cdp enable
    ppp authentication pap
    group-range 1 7

    line 1 8
    session-timeout 120 output
    exec-timeout 0 30
    autoselect during-login
    autoselect ppp
    script startup dyna-init-save
    modem Dialin
    autocommand ppp
    transport input all
    escape-character NONE
    stopbits 1
    speed 115200
    flowcontrol hardware
    robert mcfadzien, Jul 15, 2003
    #1
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  2. Not sure, but "script startup" and "script reset"
    have often had some bugs when being used to configure modems.
    It is recommended to use modem autoconfigure for this instead.
    See http://www.cisco.com/univercd/cc/td.../122cgcr/fdial_c/fnsprt2/dcdmodem.htm#1041895

    Aaron

    ---

    ~ hi
    ~
    ~ i have a 2511 access server with 8 rockwell based external modems
    ~ connected for dialin access.
    ~
    ~ When initialising the modems via a chat-script, they initialiase ok
    ~ but the DTR is not restored. dialing into each modem the first time,
    ~ the PPP authetication will fail (no authentication is performed).
    ~
    ~ After dialing into each modem once, the debug modem displays the DTR
    ~ being restored:
    ~
    ~ .Jul 15 06:38:16.541 UTC: TTY3: restoring DTR
    ~
    ~ Once its restored, authentication works ok.
    ~
    ~ If I have a chat-script execute after each session (script reset), the
    ~ modems lose DTR after each call, requiring a connection before
    ~ restoring.
    ~
    ~ below are parts of my config, any help would be appreciated.
    ~
    ~ isco Internetwork Operating System Software
    ~ IOS (tm) 2500 Software (C2500-I-L), Version 12.0(10), RELEASE SOFTWARE
    ~ (fc1)
    ~ Copyright (c) 1986-2000 by cisco Systems, Inc.
    ~ Compiled Mon 20-Mar-00 21:43 by phanguye
    ~ Image text-base: 0x0302F35C, data-base: 0x00001000
    ~
    ~ ROM: System Bootstrap, Version 11.0(10c), SOFTWARE
    ~ BOOTFLASH: 3000 Bootstrap Software (IGS-BOOT-R), Version 11.0(10c),
    ~ RELEASE SOFTWARE (fc1)
    ~
    ~ ait-dama uptime is 1 week, 4 days, 8 hours, 27 minutes
    ~ System restarted by reload at 22:22:34 UTC Thu Jul 3 2003
    ~ System image file is "flash:c2500-i-l.120-10.bin"
    ~
    ~ cisco 2511 (68030) processor (revision M) with 6144K/2048K bytes of
    ~ memory.
    ~ Processor board ID 20610076, with hardware revision 00000000
    ~ Bridging software.
    ~ X.25 software, Version 3.0.0.
    ~ 1 Ethernet/IEEE 802.3 interface(s)
    ~ 2 Serial network interface(s)
    ~ 16 terminal line(s)
    ~ 32K bytes of non-volatile configuration memory.
    ~ 8192K bytes of processor board System flash (Read ONLY)
    ~
    ~ Configuration register is 0x2102
    ~
    ~
    ~
    ~ interface Group-Async1
    ~ ip unnumbered Ethernet0
    ~ no ip directed-broadcast
    ~ encapsulation ppp
    ~ ip tcp header-compression passive
    ~ async mode dedicated
    ~ peer default ip address pool setup_pool
    ~ no cdp enable
    ~ ppp authentication pap
    ~ group-range 1 7
    ~
    ~ line 1 8
    ~ session-timeout 120 output
    ~ exec-timeout 0 30
    ~ autoselect during-login
    ~ autoselect ppp
    ~ script startup dyna-init-save
    ~ modem Dialin
    ~ autocommand ppp
    ~ transport input all
    ~ escape-character NONE
    ~ stopbits 1
    ~ speed 115200
    ~ flowcontrol hardware
    Aaron Leonard, Jul 17, 2003
    #2
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