Don't bother with copying PCAP files, just pipe tcpdump over SSH into wireshark! Great for embedded system work.
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|# from your workstation run below where <expression> is your tcpdump expression|
|# works great on OSX|
|ssh firstname.lastname@example.org "/path/to/tcpdump -s 0 -U -w - -i ethX <expression>" |wireshark -i - -k|