Cisco recently has shifted its learning academy resources to Skillsforall domain, it is bit difficult to find direct link to cisco packet tracer at present.
https://skillsforall.com/resources/lab-downloads This is the link from where we can directly download latest version cisco packet tracer for windows, linux & mac
Here are direct links to the official Cisco website where you may get the Cisco Packet Tracer:
Packet Tracer 8.1.1 Windows 64bit
Packet Tracer 8.1.1 MacOS 64bit
Packet Tracer 8.1.1 Ubuntu 64bit
Cisco Packet Tracer Download and Installation Instructions.
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On Windows (either native or running on a virtual machine from a Linux host), I can open a serial port in 8N1 mode and my desired speed of 921600 bps, and an incoming test string arrives fine from an external hardware device: HELLO WORLD.
On Linux, however, with same serial configuration I can only get slightly garbled text: H�LLO �OR�D.
However, lower baudrates (such as 460800 bps) work fine in both Windows and Linux. So by using 921600 bps I'm clearly hitting a speed maximum, imposed by some component of Linux.
Why does this happen? Does Linux have a default limit on serial baudrate? Is there anything I should configure to enable baudrates higher than 460800 bps?
Some more details:
The external device's serial output is connected to the computer via a CH340G-type serial-to-USB converter.
Tested software is TeraTerm and PuTTY on Windows, picocom, minicom, and screen on Linux.
Tested O.S. versions are Windows 7, Ubuntu Linux 16.04, and Ubuntu 20.04.
As mentioned (but it's worth repeating it), the text can be read fine if opening the serial port on Windows running from a VirtualBox virtual machine, from the same Linux host that is not able to cope itself with the mentioned baudrate! I guess this works because VirtualBox simply does a USB device passthrough, so whatever limits Linux has, they don't apply to the virtualized Windows.
In theory, my Linux seems to support the requested speed: the file /usr/include/asm-generic/termbits.h contains the definition for B921600 (together with lower ones such as B460800, and lots of other higher ones that go up to B4000000).
There is/was a bug on the CH340 driver.
Apparently, the baud rate error for 921600 bps was more than 7%. I guess that's what you might be experiencing.
I don't have any such devices so I did not research this further and I'm not sure if the patch or patches written to fix this issue ended up on the mainline kernel.
You will have to go here and find out yourself.
I wish to integrate Wifi module on my ARM920T having Linux Kernel 2.6.8.1.
I am presently working on my workstation which is a x86 system with kernel version 4.2.0-27-generic. I bought a TP-Link wifi module (TL-WN725N_V2_150911) and downloaded wifi driver from their official website http://www.tp-link.com/en/download/TL-WN725N.html#Driver for compatible OS Linux (kernel 2.6.18 ~ 3.19.3).
I was successfully able to install the module on my workstation and even got my wireless network working. I now need to port it on my target device of which I am provided the toolchain.
I have an idea of cross-compilation but not sure how new modules are integrated into the new kernel. Or may be silly doubts such as my workstation running a relatively new kernel would effect my development of modules for old kernel? Relatively new to Embedded Development, any guidance would be a pretty good learning experience.
I'm trying to write a linux driver to a device that i have the windows driver of (Similar to the case described Here, but a different device)
I'm using Libusb for the communication on the linux side, and SourceUSB as my USB sniffer (on the windows machine). Now I think I've replicated the controls and bulks properly, but I can't really test the linux log against the windows one. I'm running Ubuntu 12.04 on a VM.
So my questions are:
Is there a multiplatform logger? That could really simplify the log compare process.
When I attach the USB device to the VM - I get the VM driver in Windows. Sniffing this device gives me exactly what the device sees, right? I mean - Is this where I want to sniff?
EDIT:
I've compiled my application on windows (libusb is cross platform - A big thanks to libusb developers who did such a good job) and my application worked properly.
When sniffing the VM driver while running my application on linux, I see the requests to the USB as VENDOR_DEVICE instead of CONTROL_TRANSFER and BULK_OR_INTERRUPT. This seems to be the problem if I understand correctly, since this is what the device "sees".
So I guess my problem now is why does Linux sends my requests as vendor.
ANOTHER EDIT: Problem solved:
Listening to the VM driver gave me the wrong requests (I was listening to the VM driver traffic, not, as i wanted, the traffic of the my USB linux driver
Libusb is perfectly multiplatform. It took me a few minutes to get my code to compile under windows, and from there it was pretty easy to debug and compare logs
You can use Wireshark to capture USB traffic. This page explain how to do it for Linux and Windows : CaptureSetup/USB
I am trying to port an Windows executable to Linux using wine. I am at a point where I can run the executables but it returns some error saying it can't load "npf" driver. Is there a way to also port winpcap on Linux? The application I was trying to port is depending on winpcap library.
Thanks
libpcap? It is the original version of pcap that was then made into winpcap...
winpcap depends on the custom Windows drivers to provide access to the raw streams, it's not possible to port that as-is to wine.
winpcap is essentially a set of a Windows driver and two DLL's, wich enables applications to send&receive raw network packets to&from the network cards, and originally was a tool to have the same features than tcdump in Uxix/Linux in WIndows.
So, maybe a solution a wrapper in Linux of the "libpcap(capture) and libnet(send)" libraries, providing a winpcap binary compatibility? Playonlinux guys can help?
and I want to know if my chipset is capable off doing those things
My chipset is a intel centrino advanced 6200-n on a sony vayo laptop running on windows 7.
Now, I know that windows is only capable off listening, so I boot backtrack 4
from a usb stick.
I also want to know if a live distribution can work flawlessly with the wificard even if it does not support formentioned things, because I try'd to use wget to download something
and it says it ca not resolve the address?
thanks, Richard
Intel centrino advanced 6200-n does support both monitor mode and frame injection with iwlwifi driver. There are some intricacies involved on driver side though so it is best to use very recent kernel to make it work reliably. The patches which make this work well are expected to be part of Linux kernel version 3.5, until it's released you can build kernel yourself from iwlwifi.git tree:
http://git.kernel.org/?p=linux/kernel/git/iwlwifi/iwlwifi.git
Instructions on building kernel from a git tree:
https://wiki.ubuntu.com/KernelTeam/GitKernelBuild
It should also work with older kernels.
As for the fact that you couldn't wget something - have you connected to wireless network at all? Standard client mode in iwlwifi works very well even with old kernels.