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With traceroute-1.4a12-XX the -F argument is used to avoid intra-switch fragmentation. From traceroute(8) manpage: … -F Set the “don’t fragment” bit. … When ‘-F’ is specified the traceroute fails to get connected. Even with localhost:
While transmitting data in Urgent Mode at the socket layer: Urgent mode is initiated using send(…, MSG_OOB), Current outgoing queue is longer than MTU Several packets are sent out with the URG flag set. The Urgent Pointer field in the TCP header is not updated correctly. Instead, it stays the same.