Are there any Wireshark gurus?
I am debugging an issue on my home Zigbee network. I have a sniffer dongle and I can catch all the packets transmitted. Since my network has ~40 devices, the air is quite cluttered with packets I am not really interested in. I am looking for a ways to filter uninteresting messages
Questions:
Is there a way to filter out messages related to IEEE protocol (various Data Requests, and Acks), while leaving only upper layer messages (Zigbee, Zigbee HA)?
Is there a way to assign human readable labels for the devices on the network? e.g. 'Coordinator' instead of 0x0000, or 'Light Switch' instead of '0xc83a'?
I would propose making your own filters (whoah, relax, we are not animals, we do this the smart way) ... go to Statistics > Protocol Hierarchy, the panel should show you all the traffic by protocols. Then just identify which protocols you do not want to see, mark them (one by one), right-click and Prepare as Filter > ...and not Selected (to prepare a filter to exclude the highlighted protocol). Sadly wireshark does not allow you to select multiple protocols to exclude at once. After this simply save your filter and reuse it as much as you like
What you are trying to do is Name resolution. This is done via configuration files, more specifically ethers and hosts
Related
I have a system with multiple subsystems communicating with CANOpen. There is a main unit with a screen (for men-machine interface and stuff) and sub-units for minor operations(like sample button status, manage power, take measurements...).
We defined a CANOpen based communication protocol for this system. Subsystems share their conditions periodically with TPDO messages and do stuff according to main unit's commands sent with RPDO messages. And also some NMTs are in use too.
So I've been asked to add a new command to this protocol, zeroize. This command shall be sent broadcast and it shall cause everybody to delete softwares. What is the right way to do this?
Maybe I can use a RPDO? Are we allowed to define new NMT commands in CANopen? Maybe I can do it with NMT but by using a new commandt hat is not in use already?
Thanks in advance
Ip.
It is a bit confusing what you mean with TPDO and RPDO since the main unit's TPDO is going to be the peripheral units' RPDO and vice versa. But yes, the correct way to send out some custom broadcast message would be with a PDO.
Although, depending on what you mean with "delete software", CANopen might provide a mean for it. There are the save (OD 1010h) and load (OD 1011h) registers in the object dictionary. Save is to be used for the purpose of storing all CANopen communication (PDO configuration, mapping etc) in non-volatile memory. And load is used to restore CANopen parameters to factory defaults. These should however not be used to save/load application-specific settings.
You are not allowed to define new NMT commands.
Objects 1010h and 1011h can be used to reset the values in the object dictionary. If you really want to delete the software, the firmware upgrade protocol from CiA 302-3 might help. Writing 00h (Stop program) followed by 03h (Clear program) to object 1F51h sub-index 1 on the slave will delete the application. Whether it's actually "zeroed out" depends on the implementation. You'll need two SDO requests per slave for this though. The standard specifies that object 1F51h cannot be PDO mapped. Although that requirement may not be enforced for your devices, in which case you could achieve broadcast "zeroing" with two PDOs.
Assuming a number of different nodes and models for remaining bus simulation in CANoe produce and send out CAN frames, what is the general way to prevent CANoe to send out a message with a certain frame ID onto the (real) CAN bus? Filtering seems to only consider incoming messages.
There are different ways to tell the nodes to not send a frame (by interacting with the IL settings), but is there a general way? CANalyzer seems to have the possibility to insert nodes into the bus/evaluation tree that are not transparent to frames, but I neither see this option in CANoe nor could I confirm that this works for outgoing messages as well.
You can add output filters in the simulation setup to each simulated node.
Right click on the leg that is connecting the node to the bus. Then choose Output -> Insert Filter.
This inserts a small node between the ECU and the bus. By double-clicking on the node you can configure which messages to be filtered out.
Unfortunately there seems to be no way to configure this bus-wide. I.e. you would have to do this node-by-node.
HTH
We have a group of users who need to see the payloads of packets in wireshark captures. I'm looking for a way to remind them users that the data contained within may not represent the exact frames on the wire (because the capture will have been pre-processed by the time they get it to remove, e.g. security-sensitive IP addresses). A hook in the capture file that triggered a popup with a short message would be perfect. Is there anyway to do this, short of wrapping Wireshark with another binary (which would be trivially bypass-able anyway)?
I've searched in the wireshark lists but come up empty.
The only thing you could do would be to have the pre-processing program write out the file in pcapng format and add a comment to the initial Section Header Block giving that warning. That won't produce a popup - but, then, not all the capture file reading programs in the Wireshark suite are GUI programs that could produce a popup.
I know how to create custom columns however I am having a hard time generating the filter I need in order to determine if a network packet is Open/WEP/WPA protected. Wireshark has this capability, I have seen it in the WLAN Statistics tool.
I would assume it would be some sort of wlan_mgt.rsn. However I have only got wlan.rsn.akms.type to display 'PSK'. I am close to what I want just not exactly what I want.
Try wlan_mgt.rsn.akms.type.
See also the Wireshark Display Filter Reference: wlan_mgt
This is a little off the beaten path. I've got a DLink DWL-G520 card I'm using under OpenBSD and it works fine. What I want to do is be able to access the radio part of it. Why? I want to use it in a radio telescope. It's a 2.4 GHz receiver with an external antenna connector. I want to connect some coax, some amplifiers, and an old TV dish and point the dish at the sky. It has an RSSI signal and variable RF gain (which it adjusts, from what I can find) so all I'd need to do is record those over time while pointed at a certain spot in the sky. I don't need to control the frequency really since most natural events are broadband.
I'm poking through the OpenBSD ath driver following nested structs but I don't want any of the normal network stuff, which is most of what the driver does. dmesg identifies it as an AR5212 which according to the Atheros PDF is always paired with an AR2112 radio. Is there any easier way than wading through PCI stuff to see what my options are? I need to turn the transmitter off so it doesn't fry my amps too. Trying to find low level documentation is about impossible from what I've seen. Ultimately I'd like to have this work with other WiFi cards too, but I'll start with this one. I've got a Cistron with an external antenna connector also.
Alan, ab1jx