> Does current PCAP library support VLAN packet capturing? Since recent Linux 
> kernels support VLAN, not sure whether PCAP support it also?

What do you mean by "VLAN packet capturing"?

libpcap can capture on any link-layer device that supports PF_PACKET
sockets; if Linux implements "virtual interfaces" for VLANs, you can
probably capture on that and see the traffic on the VLAN.

You can probably also capture traffic on the physical interface, which
means you'd see traffic for all VLANs.
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