Hi, according to RFC 768 the UDP checksum is optional, and indeed the kernel has support for the SO_NO_CHECK socket option (boolean: 0 == default, calculate checksum on xmit, 1 == do not calculate checksum on xmit). Maybe you would like to add this to socket(7). Thanks Johannes -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html