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(This is really a libpcap question, but....)

The packets are always VLAN encapsulated.

That means that all filters must be of the form "vlan XXX"; for example, "vlan ip" to find IP packets, "vlan arp" to find ARP packets, etc..

(This is really a libpcap question, but....)

The packets are always VLAN encapsulated.

That means that all filters must be of the form "vlan and XXX"; for example, "vlan and ip" to find IP packets, "vlan and arp" to find ARP packets, etc..