In NF_IP_LOCAL_OUT, I hooked the TCP SYN packets and directly sent out by dev_queue_xmit. The packets can be successfully sent out, and the peer replies with SYN+ACK. Unfortunately, the local host does not accept the packet but replies with ICMP error information, i.e., destination unreachable (host administratively prohibited. May I know how to fix this issue? Thanks. Best Regards, Qi -- To unsubscribe from this list: send the line "unsubscribe netfilter-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html