Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.os.linux.setup > #517

Re: Serial console to RHEL6 on Dell R310?

Show all headers | View raw

On 14.6.11 6:37 , Jeremiah DeWitt Weiner wrote:
> Tim Watts<tw@dionic.net>  wrote:
>> Has linux (well, udev) made you a /dev/ttyS0 or /dev/ttyS1 device?
>
> 	Yes, the devices are there.
>
> crw-------. 1 root root 	4, 64 Jun 13 17:20 /dev/ttyS0
> crw-------. 1 root root 	4, 65 Jun 13 17:18 /dev/ttyS1
>
>
>> Next I'd try
>> bash<  /dev/ttyS0>  /dev/ttyS0 2>&1
>> and see if there's life at the other end.
>
> 	Nothing there.  The agetty is running -
>   PID	TTY		STAT	TIME	COMMAND
> 1650	ttyS0	Ss+		0:00	/sbin/agetty /dev/ttyS0 9600 vt100-nav
> - but I get nothing back when running that shell.
>
>
>> stty -a<  /dev/ttyS0
>> should give you the current serial config.
>
> 	That looks OK...not going to retype the whole thing, but:
> speed 9600 baud; rows 0; columns 0; line = 0;
> - the rest looks pretty normal.
>
> 	Now here is the really weird thing...connecting ttyS0 on the target
> server to the console port of one of our network switches (with the getty
> still running on the server!) and running minicom, I hit Enter a couple
> times and see:
>
> ServerIronADX 1000>
> ServerIronADX 1000>Red Hat Enterprise Linux Server release 6.1 (Santiago)
> Invalid input
>
> and then further intermixed switch login prompts, server login prompts,
> and error messages from both devices.  So the server _is_ outputting a
> login prompt on the serial console!  But then why doesn't it show up
> anywhere else?  This is breaking my brain.  All I can think of is that
> there's some misconfiguration somewhere, but some of the hardware is
> also doing some autocorrection or something...crazy, but I'm kind of out
> of other ideas.
>
>

The switch serial port is configured as a DCE (modem), and the
computer serial port is configured as a DTE, and I guess that your
cable is a straight cable.

You need a null-modem cable.

-- 

Tauno Voipio

Back to comp.os.linux.setup | Previous | Next — Previous in thread | Next in thread | Find similar

Thread

Serial console to RHEL6 on Dell R310? Jeremiah DeWitt Weiner <jdw@panix.com> - 2011-06-13 21:19 +0000
  Re: Serial console to RHEL6 on Dell R310? Tim Watts <tw@dionic.net> - 2011-06-13 23:45 +0100
    Re: Serial console to RHEL6 on Dell R310? Jeremiah DeWitt Weiner <jdw@panix.com> - 2011-06-14 15:37 +0000
      Re: Serial console to RHEL6 on Dell R310? Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2011-06-14 20:25 +0300
        Re: Serial console to RHEL6 on Dell R310? Jeremiah DeWitt Weiner <jdw@panix.com> - 2011-06-16 19:35 +0000
      Re: Serial console to RHEL6 on Dell R310? Bill Marcum <bill@lat.localnet> - 2011-06-14 16:20 -0400
  Re: Serial console to RHEL6 on Dell R310? Todd <Todd@invalid.com> - 2011-06-13 20:51 -0700
    Re: Serial console to RHEL6 on Dell R310? The Natural Philosopher <tnp@invalid.invalid> - 2011-06-14 11:04 +0100
    Re: Serial console to RHEL6 on Dell R310? Doug Freyburger <dfreybur@yahoo.com> - 2011-06-14 14:32 +0000

csiph-web