1This target provides userspace logging of matching packets. When this 2target is set for a rule, the Linux kernel will multicast this packet 3through a 4.IR netlink 5socket. One or more userspace processes may then subscribe to various 6multicast groups and receive the packets. 7Like LOG, this is a "non-terminating target", i.e. rule traversal 8continues at the next rule. 9.TP 10.BI "--ulog-nlgroup " "nlgroup" 11This specifies the netlink group (1-32) to which the packet is sent. 12Default value is 1. 13.TP 14.BI "--ulog-prefix " "prefix" 15Prefix log messages with the specified prefix; up to 32 characters 16long, and useful for distinguishing messages in the logs. 17.TP 18.BI "--ulog-cprange " "size" 19Number of bytes to be copied to userspace. A value of 0 always copies 20the entire packet, regardless of its size. Default is 0. 21.TP 22.BI "--ulog-qthreshold " "size" 23Number of packet to queue inside kernel. Setting this value to, e.g. 10 24accumulates ten packets inside the kernel and transmits them as one 25netlink multipart message to userspace. Default is 1 (for backwards 26compatibility). 27.br 28