<p>today's "I can't believe I wasted half a hour on this" computer issue: whether Wireshark validates the Ethernet checksum in packets depends on the capture format you're using</p><p>.snoop: nope, and ignores all settings including "always check FCS"<br />.pcap: yep</p><p>saving a .snoop file as a .pcap file makes it immediately check all FCS</p>