wireshark/tcpdump in Ubuntu, was capturing all 802.11 wifi packets ( beacon, probrequest, probresponse, association request/response and data packets). Now only beacon, prob response packets capturing. pls help, what is the problem for capturing other packets.
Related
When I use Wireshark to capture traffics with my wlan card with monitor mode already set, it only displays 802.11 frames. However, if I use Wireshark with managed mode wlan(promiscuous mode), it certainly displays 802.3 frames.
I searched for some related information and found out that 'network bridging' allows devices to convert 802.11 wireless packets to 802.3 packets. In case of packet capturing, pcap allows conversion.
(link: How to real time convert wireless packet(802.11) to Ethernet packet(802.3) in windows?)
So, Why is 802.11 to 802.3 frame conversion impossible when using monitor mode(not associated to the wireless network)?
Below are pictures of the situation. Thank you in advance.
Promiscuous mode packet capture
Monitor mode packet capture
For one thing, not all 802.11 packets have Ethernet equivalents; only data packets do. In monitor mode, in addition to data packets, control and management packets can be captured - you're seeing those types of packets in your monitor-mode capture.
For another thing, when capturing in monitor mode on a "protected" network (WEP, WPA), data packets are encrypted (to protect them from being sniffed), and can't be converted to Ethernet packets until they're decrypted. Under some circumstances, Wireshark can decrypt them, but Wireshark doesn't do any conversion from 802.11 to 802.3 in any circumstances - when not capturing in monitor mode, the 802.11 adapter converts data packets to 802.3 packets after decrypting them, and doesn't show non-data packets to the host.
After setting up promiscuous mode on my wlan card, I started capturing packets with wireshark. But only broadcast packets or packets destined to my localhost were captured. I cannot find the reason why.
Also, after changing to monitor mode, captured packets all had 802.11 headers unlike promiscuous mode where Ethernet frames were captured. I know devices communicate with 802.11 protocols when wireless. But how is it possible that packets captured in wireshark is displayed in Ethernet frames? (when not in monitor mode)
I'm trying to determine how Apple Airpods pair and connect as seamlessly as they do, but I couldn't find any in-depth technical explanation so I embarked on a journey to figure it out for myself. I have used an Ellysis Explorer Bluetooth sniffer to sniff both BLE and Bluetooth Classic packets from the Airpods and the iPhone I have used to connect with it.
The issue is that I lack the background knowledge in Bluetooth to fully understand what I am looking at so I'm hoping somebody can explain what is appearing on the BT sniffer in the snapshots below:
The below picture is a list of the BLE packets captured after the Airpods case has been opened but BEFORE connecting to the phone.
The below picture is a list of the Bluetooth Classic packets captured after the Airpods case has been opened but BEFORE connecting to the phone.
The below picture is a list of the Bluetooth Classic packets AFTER connecting to the phone captured on top of the previous ones.
Note that there are no new BLE packets picked up after connecting.
The 1st pic shows that both ears are sending advertising packets.
Then one of the ear is paging the other ear and exchanging information.
Then the iPhone is connected to one of the ear just like normal A2DP connection.
More captures while audio is just started playing would be helpful.
Before analysing packets you need to learn about CoreBluetooth framework. CoreBluetooth deals with scanning, connecting and writing and reading data from "Bluetooth Low Energy" (BLE) devices. BLEs (Peripherals) continuously broadcast a small packet of data when they are not connected with any device Central.
First images shows data which is being broadcasted by BLE, in your case an airpod.
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.
I currently have a Estimote beacon and I am using wireshark on Ubuntu. A USB dongle which can receive BLE data is connected to my laptop. When I start the Bluetooth 0 on wireshark it does not show any data packets. What might be the reason that I cannot see any data packets even though the beacon is placed close by to the laptop. I followed this link till the "sudo wireshark" command.
http://www.orangenarwhals.com/?p=887