Hardware :: Opensuse 11 Machine Cloned With Dd, With Serial Port Blocking?
Feb 23, 2010
I have cloned an embedded system that runs Opensuse 11 x86 using dd. The embedded system uses a simple serial device, by writing to the relevant device file (/dev/ttyS2, usually). Curiously, when I write to the same serial device on the newly cloned system (which, incidentally, has almost identical hardware), thusly:
echo hello > /dev/ttyS2 the command blocks for up to a minute, before finally returning without making the hardware do anything. I can boot into Opensuse's rescue system on the clone and successfully do exactly the same thing, as I can when I boot the original's "identical" operating system. Why might this problem occur? What can I do about it?
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Jul 29, 2009
I successfully installed the virtual box on my fedora 8 system, and also created a virtual machine with windows xp OS, it works nicely, I try to configure the serial port of my virtual machine and try to configure the path for the port "screen shot are attached" it gives me the error message also the "screen shot are attached" for your review.Is kind of mistake is going on during the path setting, and how to set the path for configuring the serial port of my virtual machine so that I can use the hyper terminal tool of windows.
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May 14, 2011
I have to connect from my linux client laptop to SPARC machine by using roll-over cable and RJ45 interface on the server. On windows I always used Tera Term but don't know how to accomplish this task from linux laptop.
Is there some kind of app like TeraTerm on linux too ?
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May 10, 2010
I'm trying to set rxtxSerial to work so a Java app has access to a serial port (via SiLabs CP210x driver, port /dev/ttyUSB0). When I use update-alternatives --config java, there are 3 alternatives which provide `java'. I have tried openJDK and Sun. Both fail but with completely different messages.
[Code].....
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Jan 13, 2010
I am trying to get two way serial communications going between a Windows XP system and a Linux system (RHEL 5).I have /sbin/agetty -L 9600 ttyS0
in /etc/inittab. I am using a generic USB to serial adaptor on Windows (Unitek) and a null modem cable. I have putty configured for 9600 baud, 8 bits, no parity, one stop bit, no flow control.I get the login prompt from agetty in the putty window but input does not work; I see weird characters in the putty screen. I can echo output into the device from windows and see it, but
cat < /dev/ttyS0. just prints out weird characters from what I type.
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Mar 23, 2010
We have a new machine with RedHat enterprise 5 on it. I need to connect a serial cable to the serial port and talk to another system (old alpha system) instead of using a VT connected to the alpha.Does RedHat come with anything like Keaterm/hyperterm/etc etc?
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Apr 4, 2011
I have openSuse 11.1 and have just added a new serial port card. Do I need to do something to get the card going? My application doesn't seem to be getting data from the serial card. How would I test status. Do I use setserial .
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Feb 27, 2009
I want to install a TUSB3410 USb to serial port device on suse 10.3.
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Feb 5, 2010
I am writing some application in C, which will access a serial port device (RS232). My application is working good. But if any other application is already opened the port, I couldn't able to identify that. In windows VB program, while accessing comport through mscomm control, i am receiving an error as "Port Already Opened". But in Linux environment, through C program how can i get that? I am accessing comport 1 as follows
fd = open("/dev/ttyS0", O_RDWR | O_NOCTTY | O_SYNC);
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Jun 7, 2011
My ISP (Cox) is blocking port 80 and I would like to know if there is a way to open it again. I am to taking about 8080, 8000 or 81 I want to use 80 so I can host my website and every one can access it without the need to put [url]:[PORT] at the URL
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Apr 15, 2011
I have the default to deny all. The only rule I have in there is:
Code:
To Action From
-- ------ ----
[code]....
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Jan 30, 2010
So first off, it probably seems this question has been asked thousands of times before. but I did do a search, mostly archived posts that ended up being something other than a true ip blocking of the port. [URL]..
So my port 80 is truly blocked. Ive tried setting up the port forwarding on my router, Ive tried manually allowing all traffic on port 80 through ip tables. Ive even dabbled with setting up something like openDNS to see So far nothing, Im only available on my local network.
There has to be some way to do a redirect though. even something as simple as an htaccess file redirecting [URL].. xxxx (the space is there to avoid my url being interrupted by a smiley
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Oct 5, 2010
I have Ubuntu Server (x64) installed on my box with Apache2 and Squid. For awahile port 80 (http) was fine, I could update packages and use wget. Then one random day port 80 became blocked for incoming traffic. I couldn't use apt-get and had to change to an ftp mirror to update. Also wget is not working.
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Nov 7, 2010
In order to connect to the internet when i am at work i have to use a proxy server; the problem is that this proxy also blocks port xxxxx which is used by a internet radio station. Is there any way to be able to listen to that radio station?
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Feb 22, 2011
I'm having an issue with ufw and Synergy. I'm trying to run my Xubuntu 10.10 desktop as a server, and my Xubuntu 10.10 laptop as a client. I can do this just fine as long as I either: Have ufw enabled on my client but disabled on my server Have ufw disabled on both my client and my server I have no custom rules added to iptables on my client. On my server, however, I have tried the following rules:
$ ufw allow from 192.168.0.0/24 to any port 24800 $ ufw allow from 192.168.0.0/24
Neither of these configurations works. ufw on my server seems to block my client's requests regardless of having port 24800 fully open from any local connection, or just flat-out fully allowing any incoming local connection. I'm not sure why ufw seems to be ignoring the rules I'm creating, but as it stands right now, the only way I can connect the two is if I have ufw on my server disabled. And I have tried to ping the two machines; each machine can ping the other, even if ufw is running on both.
And I can ping the router, as well, from both machines. Any ideas on where to go from here to troubleshoot? I should probably also add that I am using the same configuration file that I do on vanilla Ubuntu (with updated host names, of course), and I have no problems in Ubuntu. This seems to be specific to ufw and my Xubuntu desktop. I can paste the code for my server's configuration file, if desired.
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Jun 13, 2010
I am currently having problems with my server. Its being DDOSed. I have a vps with Centos 64bit. The attack I want to block is udp flood. I was trying to do something like this: iptables -I INPUT -p udp --dport 123 -m limit --limit 40/s -j DROP but instead of blocking certain hosts it blocks the whole port and during the attack its unreachable. How to limit packets per host or any other way to protect from udp flood.
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May 16, 2011
I am currently running Debian 6. I would like to know if there is a way and how i would go about blocking a certain IP range from connecting to my server within a certain port range. Say for example.
i want to block ip range 123.123.123.* from connecting to my server on the ports 33000 - 43000. But, i want to allow them to connect on any other port range, and i want to be able to allow connections from my server to the blocked ip range on those same ports. so, blocking incoming only on the above port range.
using iptables.
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Jan 11, 2011
I am at a loss how to prevent Denial of Service attacks to port 25 and not block legitimate connections from 2 Barracuda 800(s) and block smart phones such as iPhones/Blackberrys/iPhones that use the server smtp.server.com for email.
Presently for port 25
RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 25 -j ACCEPT
The 2 Barracuda 800(s) make port 25 connections all the time, plus users with smart_phones have the incoming server type:
IMAP
pop.server.com
smtp.server.com
Is there a way to keep Denial of Service attacks from happening with iptables rules without causing blocking to the Barracuda(s) that make constant port 25 connections & smart phones that poll? I was thinking if I allowed the Barracuda(s) in these lines
-s (barracuda)24.xx.xx.xx -d (emailserver)24.00.xx.xx -p tcp -m tcp --dport 25 -m state --state NEW -j ACCEPT
Where the source would be the Barracuda going to the email server. It would be allowed, then I am left with how to allow other connections like Smart_Phones that connect via Port 25. I am thinking if I put rules in place doing connection counts in a minute it would result in errors connecting to the server and people would start complaining. Plus any limiting may result in blocking real traffic. Then would I need to allow the ISP range in the above example to accept port 25, I am still left with how to drop a flood/denial of service attack.
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Apr 25, 2009
How can i redirect data received on a port to another port located in a different machine? Can i do this using IPTABLES ?
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Mar 25, 2010
Can anyone one give me some pointers please, for talking to a serial port, if I use cutecom it always returns "could not open /dev /tty0 or 1 or 3 or 4, even tried ttys0 etc
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Jan 19, 2011
i would like to connect to my cisco via a console port and i dont konw how
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Apr 14, 2010
I have a laptop which has only one serial port.
I went into:
How do I know which of those "ttyS" refers to my serial port?
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Apr 27, 2011
ive been looking through several online documents and forum posts but i cant get a clearcut answer on how to set up serial port acces in ubuntu 10.04 (server).
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Aug 12, 2010
I have two usb2serial adapters connected to my PC with a null modem (I am doing some testing to learn serial comm for a particular application). I am writing to /dev/ttyUSB0 a trying to read /dev/ttyUSB1. I have used screen (screen /dev/ttyUSB1 115200) and am able to see the characters being written. I am also able to read and write with Python with the following code
Code: import serial,time,sys
ser1 = serial.Serial('/dev/ttyUSB0',baudrate=115200)
ser2 = serial.Serial('/dev/ttyUSB1',timeout=2,baudrate=115200)
ser1.open()
ser2.open()
[Code]....
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Feb 6, 2010
How do I get syslog using serial port?
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Jul 11, 2011
I can't communicate with and UPS (Eaton) via a serial port. The serial port is UP and have been tested under a Windows OS.I have set up the communication parameters and tried to establish a dialog with the UPS. Minicom is installed. Nothing appears ont the screen and the VT102 has an offline status. The OS is Red Hat Enterprise Linux 5 64bits.Is somebody have examples to debug the serial port ?
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Jan 25, 2011
I need cause an interrupt on a serial port. If I put a single HIGH on the RX pin, will that cause one? I all ready use the 4 control lines for data.Hope I am making sense?
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Apr 14, 2009
I need a to add a usb serial port adapter. Are they all basically the same? Do I need to find a Linux compatibility list before I go shopping?
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Apr 27, 2010
I want to implement the following scenario :-[workstation1] <--ETHERNET-->[device 1]<--SERIAL-->[device 2]<--ETHERNET-->[workstation2]In short, a LAN over Serial link (RS-232 for instance).If there is a utility that offers such functionality, kindly give me the name, i've googled a bit, and found ser2net, but that only works with TELNETing.. i want it work like a normal LAN like file-sharing n all but over Serial.If there is no such software, then obv i have to program myself. regarding which i have more questions
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Apr 15, 2010
can we use inb() and outb() functions for serial port programming ??
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