Jordan Caraballo
2018-Nov-08 17:47 UTC
sudo not available after configuring ipmi serial over lan
Hi Ian, Changing the line following line from std.115200 to 3wire.115200 worked. Can you explain the why? I am not entirely sure of the difference between 3wire and std there. ttyu0 "/usr/libexec/getty 3wire.115200" vt100 on secure Thanks, - Jordan El jue., 8 nov. 2018 a las 10:39, Ian Lepore (<ian at freebsd.org>) escribi?:> On Thu, 2018-11-08 at 06:10 +0700, Eugene Grosbein wrote: > > 08.11.2018 5:56, Jordan Caraballo wrote: > > > > > > > > Hi guys, > > > > > > After configuring ipmi serial over lan console, I am not being able > > > to > > > execute any command related to sudo; not even "sudo su -". I am > > > using ttyu0 > > > and COM1 on a Dell R530. Everything regarding receiving output and > > > typing > > > at the serial console is fine; the only command not working is > > > sudo. > > > > > > Any ideas? Below are the configurations. > > > > > > /etc/ttys > > > > > > # Serial terminals > > > # The 'dialup' keyword identifies dialin lines to login, fingerd > > > etc. > > > #ttyu0 "/usr/libexec/getty 3wire" vt100 onifconsole secure > > > ttyu0 "/usr/libexec/getty std.115200" vt100 on secure > > Use network access to perform the following: > > > > 1) Change "on" to "off" for ttyu0 then run "init q" to apply changes. > > 2) Replace "ttyu0" with "cuau0" within same line then run "init q" > > again. > > > > Then retry using console and sudo. > > The easy way to accomplish the same thing is to change std.115200 to > 3wire.115200 (and then do 'init q'). > > -- Ian >-- Jordan
Ian Lepore
2018-Nov-08 20:07 UTC
sudo not available after configuring ipmi serial over lan
On Thu, 2018-11-08 at 12:47 -0500, Jordan Caraballo wrote:> Hi Ian, > Changing the line following line from std.115200 to 3wire.115200 > worked. > Can you explain the why? I am not entirely sure of the difference > between > 3wire and std there. > > ttyu0???"/usr/libexec/getty 3wire.115200" vt100???on??????????secure > > Thanks, > - Jordan >The standard setting honors the modem control lines on the serial port, so any attempt to open that serial device will block until the carrier- detect line on the port is asserted. The 3wire setting indicates that only RX, TX, and GND are connected, and modem-control signals should be ignored. An open of such a device will return immediately whether anything is actually connected to the serial port or not. A /dev/ttyN device is assumed to be a "call-in" device and has the blocking behavior by default. A /dev/cuaN device is assumed to be a "call-out" device that doesn't wait for modem carrier by blocking. Using the std vs 3wire designations in /etc/ttys causes init(1) to set termios(4) flags to implement blocking-open or immediate-open behavior without needing to change the device name as well. -- Ian> El jue., 8 nov. 2018 a las 10:39, Ian Lepore (<ian at freebsd.org>) > escribi?: > > > > > On Thu, 2018-11-08 at 06:10 +0700, Eugene Grosbein wrote: > > > > > > 08.11.2018 5:56, Jordan Caraballo wrote: > > > > > > > > > > > > > > > Hi guys, > > > > > > > > After configuring ipmi serial over lan console, I am not being > > > > able > > > > to > > > > execute any command related to sudo; not even "sudo su -". I am > > > > using ttyu0 > > > > and COM1 on a Dell R530. Everything regarding receiving output > > > > and > > > > typing > > > > at the serial console is fine; the only command not working is > > > > sudo. > > > > > > > > Any ideas? Below are the configurations. > > > > > > > > /etc/ttys > > > > > > > > # Serial terminals > > > > # The 'dialup' keyword identifies dialin lines to login, > > > > fingerd > > > > etc. > > > > #ttyu0??"/usr/libexec/getty 3wire"??????vt100???onifconsole > > > > secure > > > > ttyu0???"/usr/libexec/getty std.115200" > > > > vt100???on??????????secure > > > Use network access to perform the following: > > > > > > 1) Change "on" to "off" for ttyu0 then run "init q" to apply > > > changes. > > > 2) Replace "ttyu0" with "cuau0" within same line then run "init > > > q" > > > again. > > > > > > Then retry using console and sudo. > > The easy way to accomplish the same thing is to change std.115200 > > to > > 3wire.115200 (and then do 'init q'). > > > > -- Ian > > >