https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=16116
--- Comment #2 from Christopher Maynard <christopher.mayn...@igt.com> ---
(In reply to michal.pecuch from comment #0)
> LC_IDENTIFICATION=sk_SK.UTF-8, with libpcap version 1.8.1
It's possible this is a libpcap bug. You could try upgrading to the latest
version, currently 1.9.1, to see if this problem has been fixed? Download
from: https://www.tcpdump.org/. There are a couple of VLAN-related issues
mentioned in the changelog; it's possible that one of those fixed this issue.
See: https://www.tcpdump.org/libpcap-changes.txt
> On Ubuntu 19.04 on two similar computers.
> When capturing live data using capturing filter to filter specific vlan
> (vlan 545) for some reason only ethernet frames with CoS 0 are captured.
> Frames with the same vlan tag and CoS 4 are not captured by this filter.
> Without capturing vlan filter all frames are captured.
Have you looked at the resulting BPF code for the "vlan 545" capture filter to
see if it's sane? Running 'dumpcap -f "vlan 545" -d' on my system yields the
following, which looks correct to me:
Capturing on 'foo'
(000) ldh [12]
(001) jeq #0x8100 jt 2 jf 6
(002) ldh [14]
(003) and #0xfff
(004) jeq #0x221 jt 5 jf 6
(005) ret #65535
(006) ret #0
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