Index: gns3/settings.py
--- gns3/settings.py.orig
+++ gns3/settings.py
@@ -256,6 +256,10 @@ elif sys.platform.startswith("freebsd"):
     # FreeBSD
     PRECONFIGURED_PACKET_CAPTURE_READER_COMMANDS = {WIRESHARK_NORMAL_CAPTURE: 'wireshark {pcap_file} --capture-comment "{project} {link_description}"',
                                                     WIRESHARK_LIVE_TRAFFIC_CAPTURE: 'gtail -f -c +0b {pcap_file} | wireshark --capture-comment "{project} {link_description}" -o "gui.window_title:{link_description}" -k -i -'}
+elif sys.platform.startswith("openbsd"):
+    # OpenBSD 
+    PRECONFIGURED_PACKET_CAPTURE_READER_COMMANDS = {WIRESHARK_NORMAL_CAPTURE: 'wireshark {pcap_file} --capture-comment "{project} {link_description}"',
+                                                    WIRESHARK_LIVE_TRAFFIC_CAPTURE: 'tail -f -c +0 {pcap_file} | wireshark --capture-comment "{project} {link_description}" -o "gui.window_title:{link_description}" -k -i -'}
 else:
     PRECONFIGURED_PACKET_CAPTURE_READER_COMMANDS = {WIRESHARK_NORMAL_CAPTURE: 'wireshark {pcap_file} --capture-comment "{project} {link_description}"',
                                                     WIRESHARK_LIVE_TRAFFIC_CAPTURE: 'tail -f -c +0b {pcap_file} | wireshark --capture-comment "{project} {link_description}" -o "gui.window_title:{link_description}" -k -i -'}
