Comments (7)
jelu
commented on June 16, 2024
Seen this also on all Linux based platforms, FreeBSD and OpenBSD does not report this. Might be that Linux actually does not support BPF on the interface that pcap opens, will look at it when I have time.
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aabdnn
commented on June 16, 2024
FYI: I have just seen the same thing on our server, running CentOS 7.
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SvenVD
commented on June 16, 2024
Does it mean capturing fails?
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jelu
commented on June 16, 2024
No, not directly.
If filtering is not done at kernel level and your receiving a lot of
packets that are meant to be filtered it may have a huge impact on
processing when it's filtered higher up.
That may lead to drops that would not happen if it was done at kernel level.
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SvenVD
commented on June 16, 2024
Any idea when this will be fixed? I did not have this warning with the same bpf filter but with the older dsc collector (2012 ish) on CentOS 6
For the record, I am now getting this warning on a CentOS 7 with the latest dsc rpm collector
Thanks
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jelu
commented on June 16, 2024
The warning did not exist before, it is new and it can't be fixed in DSC
because it's a matter of what kernel API are available for libpcap.
It is just a warning, it's not fatal and if your filters are the same then
operational wise it is the same as before.
The warning does not appear on UNIX systems that have the right support for
kernel level filtering such as FreeBSD and OpenBSD.
The warning can also appear on these systems if the filter is too large to
fit within the kernel, then it's processed in userland.
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SvenVD
commented on June 16, 2024
Okay, thanks for this clear explanation
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