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Npcap driver works abnormally in high concurrent traffic scenarios #223

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lrh450330 opened this issue Aug 19, 2020 · 2 comments
Closed

Npcap driver works abnormally in high concurrent traffic scenarios #223

lrh450330 opened this issue Aug 19, 2020 · 2 comments

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@lrh450330
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@lrh450330 lrh450330 commented Aug 19, 2020

In the past two days, I did a stress test for npcap. It was found that when the network speed exceeded 400Mbps, npcap could not work normally. The number of packets captured was zero for a period of time, and it would run out of memory. I switched wireshake's packet capture and found that the same phenomenon occurred。

@dmiller-nmap
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@dmiller-nmap dmiller-nmap commented Aug 24, 2020

Thanks for this report! We have been working closely with a licensee who was seeing the same issues, and we expect to have a release out to address it soon. The essence of the issue is an integer underflow in the count of "free" space in the kernel buffer, and the fix is in 5abba5e, but there are lots of related changes that will go into the release.

@dmiller-nmap
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@dmiller-nmap dmiller-nmap commented Aug 26, 2020

Npcap 0.9997 resolves this issue. If you find further abnormalities in Npcap 0.9997, please open a new issue. Thanks!

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