Hello I wonder if linux (2.4 or 2.5) has a programmatic interface available to user level code to ask to send the FIN flag piggybacked in a DATA segment. Say I have an application that want to replace : send(fd, buffer, 84, 0) ; shutdown(fd, 2) ; 05:00:17.242008 hostA.80 > hostB.2159: P 1:85(84) ack 1 win 5840 (DF) 05:00:17.242041 hostA.80 > hostB.2159: F 85:85(0) ack 1 win 5840 (DF) with : /* some clever api... */ send_and_shutdown(fd, buffer, 84, FLAGS) ; 05:00:17.242008 hostA.80 > hostB.2159: PF 1:85(84) ack 1 win 5840 (DF) Thanks Eric - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html