Re: [CentOS] is it possible to login to a switch via RS232 / serial port from the shell?
John R Pierce wrote: Les Mikesell wrote: Rudi Ahlers wrote: I have a problem switch in our data centre, which is connected to a linux server via a serial cable. I know I can / could access the switch from my Windows PC back at the office, using hyperterm, but trying to access it using minicom just doesn't seem to work. I have changed the comms in minincom to use /dev/tty0 the baud rate to 9600, yet I can't seem to connect with minicom. Does anyone know how to connect to a serial device from the console? dissertation on kermit deleted his problem is that he used /dev/tty0 and not the serial port /dev/ttyS0note the big S. very important./dev/tty0 is some kinda pseudothing./dev/ttyS0 is the serial port known as COM1: in PC terms. That was a typo in my first post. I am using /dev/ttyS0 - with a bit S :) I have also noticed that there's no tty* in dmesg | grep tty or grep tty /var/log/demsg could this be the problem / reason? I'm running CentOS 5.1 x64 with Xen 3.0 kernel -- Kind Regards Rudi Ahlers CEO, SoftDux Web: http://www.SoftDux.com Check out my technical blog, http://blog.softdux.com for Linux or other technical stuff, or visit http://www.WebHostingTalk.co.za for Web Hosting stuff ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] is it possible to login to a switch via RS232 / serial port from the shell?
Rudi Ahlers wrote: That was a typo in my first post. I am using /dev/ttyS0 - with a bit S :) I have also noticed that there's no tty* in dmesg | grep tty or grep tty /var/log/demsg could this be the problem / reason? I'm running CentOS 5.1 x64 with Xen 3.0 kernel hmmm. 5.1 i686 w/o xen... $ grep tty /var/log/dmesg serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A serial8250: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A 00:0b: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A 00:0c: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A $ sudo setserial /dev/ttyS0 /dev/ttyS0, UART: 16550A, Port: 0x03f8, IRQ: 4 $ sudo setserial /dev/ttyS1 /dev/ttyS1, UART: 16550A, Port: 0x02f8, IRQ: 3 (old school pentium-III 800 on a i815 board) ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] is it possible to login to a switch via RS232 / serial port from the shell?
John R Pierce wrote: Rudi Ahlers wrote: That was a typo in my first post. I am using /dev/ttyS0 - with a bit S :) I have also noticed that there's no tty* in dmesg | grep tty or grep tty /var/log/demsg could this be the problem / reason? I'm running CentOS 5.1 x64 with Xen 3.0 kernel hmmm. 5.1 i686 w/o xen... $ grep tty /var/log/dmesg serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A serial8250: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A 00:0b: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A 00:0c: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A $ sudo setserial /dev/ttyS0 /dev/ttyS0, UART: 16550A, Port: 0x03f8, IRQ: 4 $ sudo setserial /dev/ttyS1 /dev/ttyS1, UART: 16550A, Port: 0x02f8, IRQ: 3 (old school pentium-III 800 on a i815 board) ___ ok, so I think this is the problem then :) [EMAIL PROTECTED] /]# grep tty /var/log/dmesg Xen virtual console successfully installed as ttyS0 [EMAIL PROTECTED] /]# setserial /dev/ttyS0 Cannot get serial info: Invalid argument [EMAIL PROTECTED] /]# It may seem that Xen uses ttyS0 for itself, but how do I get around it? -- Kind Regards Rudi Ahlers CEO, SoftDux Web: http://www.SoftDux.com Check out my technical blog, http://blog.softdux.com for Linux or other technical stuff, or visit http://www.WebHostingTalk.co.za for Web Hosting stuff ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] is it possible to login to a switch via RS232 / serial port from the shell?
Isn't the switch accessible via a Web interface? Most are. If so, why not use a browser to access it? It is much more practical nowadays. Of course, I don't know your concrete case, I am thinking generally. No virus found in this outgoing message. Checked by AVG. Version: 8.0.100 / Virus Database: 270.4.1/1513 - Release Date: 22-06-2008 7:52 ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] is it possible to login to a switch via RS232 / serial port from the shell?
Miguel Medalha wrote: Isn't the switch accessible via a Web interface? Most are. If so, why not use a browser to access it? It is much more practical nowadays. Of course, I don't know your concrete case, I am thinking generally. Yes, it was accessible via the web, until I changed the IP - but forgot to change the subnet mask as well. So, I could drive to the IDC and reset it, but this made me realize that I need to get serial console working for fixing / debugging purposes as well. Luckily when I installed the switch, I connected the serial cable to the CentOS server as well, thought it would be a handy backup measure, until now. -- Kind Regards Rudi Ahlers CEO, SoftDux Web: http://www.SoftDux.com Check out my technical blog, http://blog.softdux.com for Linux or other technical stuff, or visit http://www.WebHostingTalk.co.za for Web Hosting stuff ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] is it possible to login to a switch via RS232 / serial port from the shell?
Yes, it was accessible via the web, until I changed the IP - but forgot to change the subnet mask as well. (...) Can you configure some computer with a manual IP address and subnet mask to fit those the switch has now? You would then be able to change its setup. No virus found in this outgoing message. Checked by AVG. Version: 8.0.100 / Virus Database: 270.4.1/1513 - Release Date: 22-06-2008 7:52 ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] is it possible to login to a switch via RS232 / serial port from the shell? - SOLVED
Tru Huynh wrote: Hi Rudi, 1) please TRIM the replies. 2) don't let people try to guess your setup - your initial email does not event state your CentOS version/arch - your should have told that you were using xen at the very beginning - post the relevant lines of /var/log/messages and/or the config files of the program(s) you are using: it will avoid typos such as tty0/ttyS0 ... just like you did with: :D [EMAIL PROTECTED] /]# grep tty /var/log/dmesg Xen virtual console successfully installed as ttyS0 [EMAIL PROTECTED] /]# setserial /dev/ttyS0 Cannot get serial info: Invalid argument [EMAIL PROTECTED] /]# It may seem that Xen uses ttyS0 for itself, but how do I get around it? show the grub.conf entry of your kernels (dom0/domU) and/or /proc/cmdline content. Tru __ Hi Tru Sorry for the inconvenience, since this is a CentOS list, I didn't think it's necessary to say I'm using CentOS. And to be honest with you, I didn't think there's a problem on the server, but more that I didn't know how to use minicom - which was the case. Only after people recommended a few other things, did I think of Xen. Anyway, it's working now. I had to change the Xen config in /boot/grub/menu and tell Xen not to use ttyS0 as a serial console for itself. http://wiki.xensource.com/xenwiki/InstallationNotes#head-b915c65538e3d0cb29da04e05cb278e44624a522 -- Kind Regards Rudi Ahlers CEO, SoftDux Web: http://www.SoftDux.com Check out my technical blog, http://blog.softdux.com for Linux or other technical stuff, or visit http://www.WebHostingTalk.co.za for Web Hosting stuff ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] is it possible to login to a switch via RS232 / serial port from the shell? - SOLVED
On 23/06/2008, at 7:56 PM, Rudi Ahlers wrote: Anyway, it's working now. I had to change the Xen config in /boot/ grub/menu and tell Xen not to use ttyS0 as a serial console for itself. http://wiki.xensource.com/xenwiki/InstallationNotes#head-b915c65538e3d0cb29da04e05cb278e44624a522 Good to hear it's working. FYI, for future reference since not many people seem to know this, simple GNU 'screen' is also a terminal emulator and is *much* more simple than minicom, kermit, etc. $ yum install screen $ screen /dev/ttyS0 'man screen' for more info. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] is it possible to login to a switch via RS232 / serial port from the shell?
Barry Brimer wrote: I have a problem switch in our data centre, which is connected to a linux server via a serial cable. I know I can / could access the switch from my Windows PC back at the office, using hyperterm, but trying to access it using minicom just doesn't seem to work. I have not been following this thread, but has minicom been suggested? Barry ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos Hi Barry Yes, I am trying minicom, but have had no luck :( -- Kind Regards Rudi Ahlers CEO, SoftDux Web: http://www.SoftDux.com Check out my technical blog, http://blog.softdux.com for Linux or other technical stuff, or visit http://www.WebHostingTalk.co.za for Web Hosting stuff ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] is it possible to login to a switch via RS232 / serial port from the shell?
Hi all I have a problem switch in our data centre, which is connected to a linux server via a serial cable. I know I can / could access the switch from my Windows PC back at the office, using hyperterm, but trying to access it using minicom just doesn't seem to work. I have changed the comms in minincom to use /dev/tty0 the baud rate to 9600, yet I can't seem to connect with minicom. Does anyone know how to connect to a serial device from the console? -- Kind Regards Rudi Ahlers CEO, SoftDux Office: 087 805-9573 Fax No: 086 609 6128 Cell: 082 554 7532 Web: http://www.SoftDux.com Forum: http://Forum.SoftDux.com Join SA WebHostingTalk today, on http://www.WebHostingTalk.co.za ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] is it possible to login to a switch via RS232 / serial port from the shell?
Rudi Ahlers wrote: Hi all I have a problem switch in our data centre, which is connected to a linux server via a serial cable. I know I can / could access the switch from my Windows PC back at the office, using hyperterm, but trying to access it using minicom just doesn't seem to work. I have changed the comms in minincom to use /dev/tty0 the baud rate to 9600, yet I can't seem to connect with minicom. Does anyone know how to connect to a serial device from the console? try /dev/ttyS0 or /dev/ttyS1 for the serial ports. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] is it possible to login to a switch via RS232 / serial port from the shell?
I have changed the comms in minincom to use /dev/tty0 the baud rate to 9600, yet I can't seem to connect with minicom. Does anyone know how to connect to a serial device from the console? This works for me with our Cisco console cables: sudo yum install picocom sudo picocom /dev/ttyS0 BR Bent ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] is it possible to login to a switch via RS232 / serial port from the shell?
Bent Terp wrote: I have changed the comms in minincom to use /dev/tty0 the baud rate to 9600, yet I can't seem to connect with minicom. Does anyone know how to connect to a serial device from the console? This works for me with our Cisco console cables: sudo yum install picocom sudo picocom /dev/ttyS0 BR Bent ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos but will that program work for other devices as well? this is a cheap D-Link layer2 managed switch. -- Kind Regards Rudi Ahlers CEO, SoftDux Web: http://www.SoftDux.com Check out my technical blog, http://blog.softdux.com for Linux or other technical stuff, or visit http://www.WebHostingTalk.co.za for Web Hosting stuff ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] is it possible to login to a switch via RS232 / serial port from the shell?
John R Pierce wrote: Rudi Ahlers wrote: Hi all I have a problem switch in our data centre, which is connected to a linux server via a serial cable. I know I can / could access the switch from my Windows PC back at the office, using hyperterm, but trying to access it using minicom just doesn't seem to work. I have changed the comms in minincom to use /dev/tty0 the baud rate to 9600, yet I can't seem to connect with minicom. Does anyone know how to connect to a serial device from the console? try /dev/ttyS0 or /dev/ttyS1 for the serial ports. ___ Sorry, I am using ttyS0 no tty0 - using ttyS1 doesn't help either. Am I doing this right? I press CTRL + A + M to Initialize Modem, or should I be issuing a different command to connect? -- Kind Regards Rudi Ahlers CEO, SoftDux Web: http://www.SoftDux.com Check out my technical blog, http://blog.softdux.com for Linux or other technical stuff, or visit http://www.WebHostingTalk.co.za for Web Hosting stuff ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] is it possible to login to a switch via RS232 / serial port from the shell?
Bent Terp wrote: I have changed the comms in minincom to use /dev/tty0 the baud rate to 9600, yet I can't seem to connect with minicom. Does anyone know how to connect to a serial device from the console? This works for me with our Cisco console cables: sudo yum install picocom sudo picocom /dev/ttyS0 BR Bent ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos On which OS did you install this? On CentOS? If so, which repository did you have to add, cause I see the ones I have enabled doesn't have it? [EMAIL PROTECTED] ~]# yum install picocom Loading installonlyn plugin Setting up Install Process Setting up repositories rpmforge 100% |=| 1.1 kB00:00 base 100% |=| 1.1 kB00:00 updates 100% |=| 951 B00:00 addons100% |=| 951 B00:00 extras100% |=| 1.1 kB00:00 Reading repository metadata in from local files Parsing package install arguments Nothing to do -- Kind Regards Rudi Ahlers CEO, SoftDux Web: http://www.SoftDux.com Check out my technical blog, http://blog.softdux.com for Linux or other technical stuff, or visit http://www.WebHostingTalk.co.za for Web Hosting stuff ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] is it possible to login to a switch via RS232 / serial port from the shell?
Rudi Ahlers wrote: Hi all I have a problem switch in our data centre, which is connected to a linux server via a serial cable. I know I can / could access the switch from my Windows PC back at the office, using hyperterm, but trying to access it using minicom just doesn't seem to work. I have changed the comms in minincom to use /dev/tty0 the baud rate to 9600, yet I can't seem to connect with minicom. Does anyone know how to connect to a serial device from the console? That should work, but I usually use kermit which has a lot more options and is scriptable. With kermit, try: set line /dev/ttyS0 set carrier off (just in case the device doesn't raise CD) connect then it is control-] followed by 'c' to get back to kermit. -- Les Mikesell [EMAIL PROTECTED] ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] is it possible to login to a switch via RS232 / serial port from the shell?
Les Mikesell wrote: Rudi Ahlers wrote: Hi all I have a problem switch in our data centre, which is connected to a linux server via a serial cable. I know I can / could access the switch from my Windows PC back at the office, using hyperterm, but trying to access it using minicom just doesn't seem to work. I have changed the comms in minincom to use /dev/tty0 the baud rate to 9600, yet I can't seem to connect with minicom. Does anyone know how to connect to a serial device from the console? That should work, but I usually use kermit which has a lot more options and is scriptable. With kermit, try: set line /dev/ttyS0 set carrier off (just in case the device doesn't raise CD) connect then it is control-] followed by 'c' to get back to kermit. where do I get kermit? yum install kermit returned no results -- Kind Regards Rudi Ahlers CEO, SoftDux Web: http://www.SoftDux.com Check out my technical blog, http://blog.softdux.com for Linux or other technical stuff, or visit http://www.WebHostingTalk.co.za for Web Hosting stuff ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] is it possible to login to a switch via RS232 / serial port from the shell?
On Sun, Jun 22, 2008 at 09:57:08PM +0200, Rudi Ahlers wrote: Les Mikesell wrote: Rudi Ahlers wrote: Hi all I have a problem switch in our data centre, which is connected to a linux server via a serial cable. I know I can / could access the switch from my Windows PC back at the office, using hyperterm, but trying to access it using minicom just doesn't seem to work. I have changed the comms in minincom to use /dev/tty0 the baud rate to 9600, yet I can't seem to connect with minicom. Does anyone know how to connect to a serial device from the console? That should work, but I usually use kermit which has a lot more options and is scriptable. With kermit, try: set line /dev/ttyS0 set carrier off (just in case the device doesn't raise CD) connect then it is control-] followed by 'c' to get back to kermit. where do I get kermit? yum install kermit returned no results I don't know, just offhand, where you can get a binary ready to install on Centos or RH. But if you're not afraid to compile it yourself you can find it here: http://www.columbia.edu/kermit/ck80.html Shouldn't be anything harder than unpacking the archive and typing make linux. -- Fred Smith -- [EMAIL PROTECTED] - But God demonstrates his own love for us in this: While we were still sinners, Christ died for us. --- Romans 5:8 (niv) -- pgprYnUemcZOq.pgp Description: PGP signature ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] is it possible to login to a switch via RS232 / serial port from the shell?
Rudi Ahlers wrote: Hi all I have a problem switch in our data centre, which is connected to a linux server via a serial cable. I know I can / could access the switch from my Windows PC back at the office, using hyperterm, but trying to access it using minicom just doesn't seem to work. issues like this which are not related to CentOS should be marked with an [OT] tag in the subject line as a start -- Karanbir Singh : http://www.karan.org/ : [EMAIL PROTECTED] ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] is it possible to login to a switch via RS232 / serial port from the shell?
Bent Terp wrote: I have changed the comms in minincom to use /dev/tty0 the baud rate to 9600, yet I can't seem to connect with minicom. Does anyone know how to connect to a serial device from the console? This works for me with our Cisco console cables: sudo yum install picocom sudo picocom /dev/ttyS0 BR Bent ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos I have just noticed that there's no serial device loaded, yet I know it's enabled in the BIOS. The only reference I could find in dmesg for serial ports is this: Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing enabled r8169 Gigabit Ethernet driver 2.2LK-NAPI loaded GSI 20 sharing vector 0xC0 and IRQ 20 ACPI: PCI Interrupt :01:00.0[A] - GSI 20 (level, low) - IRQ 20 eth0: Identified chip type is 'RTL8169s/8110s'. [EMAIL PROTECTED] ~]# more /var/log/dmesg | grep ser Memory: 433664k/532480k available (2358k kernel code, 89936k reserved, 1325k data, 172k init) PCI: BIOS Bug: MCFG area at d000 is not E820-reserved pnp: 00:08: ioport range 0x400-0x4bf could not be reserved - User ID: CentOS (Kernel Module GPG key) serio: i8042 KBD port at 0x60,0x64 irq 1 serio: i8042 AUX port at 0x60,0x64 irq 12 8250_pnp: Unknown symbol serial8250_unregister_port 8250_pnp: Unknown symbol serial8250_register_port So, it seems like there's no serial port in the Xen kernel, or am I missing something? How do I get the serial port to work in CentOS 5.1 + Xen? -- Kind Regards Rudi Ahlers CEO, SoftDux Web: http://www.SoftDux.com Check out my technical blog, http://blog.softdux.com for Linux or other technical stuff, or visit http://www.WebHostingTalk.co.za for Web Hosting stuff ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] is it possible to login to a switch via RS232 / serial port from the shell?
Karanbir Singh wrote: Rudi Ahlers wrote: Hi all I have a problem switch in our data centre, which is connected to a linux server via a serial cable. I know I can / could access the switch from my Windows PC back at the office, using hyperterm, but trying to access it using minicom just doesn't seem to work. issues like this which are not related to CentOS should be marked with an [OT] tag in the subject line as a start I'm sorry, but I don't see the relevance. The switch is connected via serial cable to a CentOS 5.1 x64 server, and I need to connect to it from CentOS, but can't. Please explain to me how it's not related to CentOS? The fact that I mentioned Windows, is purely to indicate that the serial port works, and it can be connected to via serial cable. -- Kind Regards Rudi Ahlers CEO, SoftDux Web: http://www.SoftDux.com Check out my technical blog, http://blog.softdux.com for Linux or other technical stuff, or visit http://www.WebHostingTalk.co.za for Web Hosting stuff ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] is it possible to login to a switch via RS232 / serial port from the shell?
I have a problem switch in our data centre, which is connected to a linux server via a serial cable. I know I can / could access the switch from my Windows PC back at the office, using hyperterm, but trying to access it using minicom just doesn't seem to work. I have not been following this thread, but has minicom been suggested? Barry ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] is it possible to login to a switch via RS232 / serial port from the shell?
Les Mikesell wrote: Rudi Ahlers wrote: I have a problem switch in our data centre, which is connected to a linux server via a serial cable. I know I can / could access the switch from my Windows PC back at the office, using hyperterm, but trying to access it using minicom just doesn't seem to work. I have changed the comms in minincom to use /dev/tty0 the baud rate to 9600, yet I can't seem to connect with minicom. Does anyone know how to connect to a serial device from the console? dissertation on kermit deleted his problem is that he used /dev/tty0 and not the serial port /dev/ttyS0note the big S. very important./dev/tty0 is some kinda pseudothing./dev/ttyS0 is the serial port known as COM1: in PC terms. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
