capture network datagram traffic on a specific port in Fiddler Classic

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Fiddler Classic
John
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John asked on 05 Jan 2023, 04:40 PM

I have a device that broadcasts a "discovery" packet to port 5556 and would like to capture that.  How do i go about doing so?

 

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Lini
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answered on 09 Jan 2023, 11:44 AM

Hello,

In order for Fiddler to be able to capture network traffic, the origin device/application must have their proxy settings pointing to the Fiddler application proxy, which by default is running on port 8888 for Fiddler Classic. Furthermore, Fiddler only captures HTTP TCP traffic or protocols like Websocket that run on top of the HTTP TCP connection. It seems you are trying to capture broadcast packets, which are probably UDP and not TCP. If this is the case, then Fiddler will not be able to capture these packets. You will need a lower level networking tool like Wireshark.

 

 

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Lini
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John
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commented on 09 Jan 2023, 02:56 PM

Thanks for your answer.  I was unaware it only captured traffic that ran on top of the stack.  I did have the proxy set up.  It is indeed a udp packet.

 

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