I am exploring the world of USB packet capturing.
after a capture session from my USB SubZero device
I understand the data captured but don't understand the address.
Wireshark say '1.1.3' in the address and USB URB in other field.Is not a COM port like i hope it would be cause in effect
in device manager The SUBZERO is not recognized with a COM port and is under the AUDIO,GAMES... peripherics.
What to do if I want to send data to this address.
Related
I am trying to send the wifi direct probe packets using raw sockets so that mobile devices will show them in wifi direct device list.
I am trying to capture packets first in Wireshark in monitor mode in order to understand the packet structure and compare with the P2P probe request packet mentioned in Wifi Direct specification.
But I am not able to capture the correct probe packet in Wireshark. Can anyone suggest me what I am missing in my approach?
I wasn't able to capture packets with filter WLAN.addr= XX:XX:XX:XX:XX:XX. (Actual wifi Mac address), as WiFi Direct Mac address is different and the first byte was different.For example If your wifi mac is 00:04:CB:CX:DE:E7 then WiFi-Direct address is 02:04:CB:CX:DE:E7.
Also, I am able to show the device listed when I sent probe response packet to the device.
Is there a way to send UDP packets to a network MAC address?
Neither DatagramSocket nor DatagramPacket seems to have a mechanism of doing this.
Because of the layered network stack, the first response is that you cannot send a UDP message to a MAC address. My statement means that you don't have any means of setting a MAC address in a UDP datagram field. You can send a UDP datagram to an IP address and port. This IP address can be unicast, multicast, or broadcast.
If you intend to send a UDP datagram to a specific MAC address, you need to implement a more complex solution (DHCP is an example of a more complex solution). There are different strategies you can apply:
If you just need to send a datagram to a MAC address without having received any datagram from that NIC, and knowing that MAC address, first you will need to send a layer 2 frame to that MAC address (a layer 2 protocol allows you to set a MAC address). You can implement a protocol listening to that MAC address frames and being able to send a response back providing you the corresponding IP address. RARP is a protocol that lets you get an IP given the MAC address
You can implement your protocol that uses a multicast group. From your PC you send a multicast message containing the MAC address you are targeting. All nodes (applications in nodes) subscribed to that multicast group receive that message. The one with the targeted MAC address can respond. Once it responds, you have its IP address and can send a unicast UDP datagram.
The short answer is no. The networking stack is set up for the hardware address to be addressable in the OS's media layer with only a defined interface with the transport layer exposed to the application. You would need to tap into the low-level OS. It looks like you are trying to make this call within Java and it's highly unlikely that you will be able to accomplish this.
I want to observe streams between the original screen mirrored from and the target screen mirrored to to check something like frame loss, thus I'm thinking to sniff packets between sender and receiver.
Is there any plugins for Wireshark which enables me to do that..?
What you have to do is to route the network traffic through some network node that you can sniff on. Like your laptop.
I would connect the laptop to the Internet through ethernet and make a wifi hotspot on it. Then tell chromecast to connect to your hotspot. Now you're in the middle between chromecast and the Internet. Wireshark should be able to capture the traffic without any specific plugins.
Make sure you've enabled routing between ethernet and wifi hotspot.
I am able to establish connection between android and PC via Wi-fi. But this is done by hard coding the the IP address of the PC (server) in the android program. But I wanted to get IP addresses of the PC's available on the Wi-fi network programmatically. So please let me know how to scan for PC's on the network and get their respective IP address.
can you not multicast a UDP packet on the network which the server listens for and responds to with a packet containing the ip address of the server in order to set up the connection?
You should be able to find help on that topic, with some options here here and here
I got a WiFi router connected to my PC.
What I want is to send from another device some data to my PC through the Wi-Fi adapter.
Program on the device is developed using EVC++. The one on PC - on VC++.
EDIT 1:
PC has an IP address.
Another device s IP is set at program execution. I mean WiFi IP address. And then connection to WiFi router is proceeded.
EDIT 2:
What if it uses an ethernet and wifi together?
How should I make a connection through WiFi?
WiFI is no different to usual Ethernel network.
So you just usually find out IP of other computer (in config/ask user/DNS), establish usual TCP/IP connection and send data on.