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IPv4 Length exceeds Packet Length during live device capture #449

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exp111 opened this issue Mar 14, 2023 · 2 comments
Closed

IPv4 Length exceeds Packet Length during live device capture #449

exp111 opened this issue Mar 14, 2023 · 2 comments

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@exp111
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exp111 commented Mar 14, 2023

I've encountered this issue where I can't access the tcp payload data during a live recording with SharpPcap and PacketDotNet.
Looked into it a bit deeper and found out that during live recording the fragmented packets have the wrong length.
Attached is a pcap that I created using the CaptureFileWriterDevice as wireshark didn't produce faulty packets.

pcap.zip
The packet in question:
grafik
Image of the packet recorded using wireshark (not the same recording):
grafik

Maybe it's because I'm capturing the loopback device? Is this a bug in sharpcap or is it the driver?

Using Windows 10, SharpPcap 6.2.5, Npcap 1.72
Also tried using the CreatingCaptureFile example with the same result.
@kayoub5
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kayoub5 commented Mar 14, 2023

increase DeviceConfiguration.Snaplen

@exp111
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exp111 commented Mar 15, 2023

That fixed it, thanks

@exp111 exp111 closed this as completed Mar 15, 2023
This issue was closed.
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@kayoub5 @exp111