How to enter DDB through a terminal server / remote console ... ?

[User Freebsd]

On Wed, 28 Jun 2006, Robert Watson wrote:

>
> On Wed, 28 Jun 2006, User Freebsd wrote:
>
>> 'k, now that I'm up to 3 6-STABLE servers that are deadlocking, I'm 
>> spending time with the remote tech today to get a serial console put online 
>> ... how do I drop into DDB remotely, where the serial console is going 
>> through a Portmaster Terminal server?  issuing CTL-ALT-ESC, I doubt, will 
>> work, will it?
>
> If configured to use a serial console (console="comconsole" in loader.conf), 
> you can enter the debugger with BREAK_TO_DEBUGGER in the kernel config by 
> sending a serial break.  With my portmasters, I telnet to a TCP port to 
> connect to the serial console, so I send a telnet break, using ^]send break.

Have you ever had a problem with this warning: "(useful for remote 
diagnostics, but also dangerous if you generate a spurious BREAK on the 
serial port!)" in the handbook?

----
Marc G. Fournier           Hub.Org Networking Services (http://www.hub.org)
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