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Data is not captured from development board

asked 2018-07-12 18:02:18 +0000

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I am designing a FPGA containing a MAC that connects to an external PHY. The FPGA company supplies an example design that can immediately be used to illustrate the operation of the MAC. The development board containing the FPGA is connected to a Windows 7 laptop running Wireshark 2.6 1. When I configure the development board to send a continuous stream of packets Wireshark never captures any data. I have the Local Area Connection Status window open while the data is transmitting and the byte count increments rapidly because it sees data on the cable. The ethernet LED on the laptop is flashing indicating that there is traffic on the cable. I am running Wireshark as an administrator. Are there any suggests to make Wireshark capture this data?

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answered 2018-07-12 19:29:17 +0000

grahamb gravatar image

Presuming that you are capturing on the correct interface, this type of issue is often caused by AV, firewall or VPN software on the host, so check for this.

Please also note that running Wireshark with elevated privileges is not recommended as it's a security risk, you shouldn't need to do this on Windows.

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Also, the frames may be formatted incorrectly, leading to bad checksums, which would make the laptop NIC drop them before Wireshark can even see them.

Jasper gravatar imageJasper ( 2018-07-15 11:48:18 +0000 )edit

The frames that I am sending consists of a destination address, source address, length (this value is less that 1536) and a number pattern that decrements. The hardware in the FPGA automatically appends the preamble, start of frame delimiter and FCS. Is there are method of Wireshark telling me that frames are received with bad checksums?

ap gravatar imageap ( 2018-07-16 12:32:30 +0000 )edit
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Asked: 2018-07-12 18:02:18 +0000

Seen: 250 times

Last updated: Jul 12 '18