1This target provides logging of matching packets. When this target is 2set for a rule, the Linux kernel will pass the packet to the loaded 3logging backend to log the packet. This is usually used in combination 4with nfnetlink_log as logging backend, which will multicast the packet 5through a 6.IR netlink 7socket to the specified multicast group. One or more userspace processes 8may subscribe to the group to receive the packets. Like LOG, this is a 9non-terminating target, i.e. rule traversal continues at the next rule. 10.TP 11\fB\-\-nflog\-group\fP \fInlgroup\fP 12The netlink group (0 - 2^16\-1) to which packets are (only applicable for 13nfnetlink_log). The default value is 0. 14.TP 15\fB\-\-nflog\-prefix\fP \fIprefix\fP 16A prefix string to include in the log message, up to 64 characters 17long, useful for distinguishing messages in the logs. 18.TP 19\fB\-\-nflog\-range\fP \fIsize\fP 20This option has never worked, use --nflog-size instead 21.TP 22\fB\-\-nflog\-size\fP \fIsize\fP 23The number of bytes to be copied to userspace (only applicable for 24nfnetlink_log). nfnetlink_log instances may specify their own 25range, this option overrides it. 26.TP 27\fB\-\-nflog\-threshold\fP \fIsize\fP 28Number of packets to queue inside the kernel before sending them 29to userspace (only applicable for nfnetlink_log). Higher values 30result in less overhead per packet, but increase delay until the 31packets reach userspace. The default value is 1. 32.BR 33