1 This target is only valid in the 2 .B nat 3 table, in the 4 .B POSTROUTING 5 chain. It specifies that the source address of the packet should be 6 modified (and all future packets in this connection will also be 7 mangled), and rules should cease being examined. It takes one type 8 of option: 9 .TP 10 \fB\-\-to\-source\fP [\fIipaddr\fP[\fB\-\fP\fIipaddr\fP]][\fB:\fP\fIport\fP[\fB\-\fP\fIport\fP]] 11 which can specify a single new source IP address, an inclusive range 12 of IP addresses, and optionally, a port range (which is only valid if 13 the rule also specifies 14 \fB\-p tcp\fP 15 or 16 \fB\-p udp\fP). 17 If no port range is specified, then source ports below 512 will be 18 mapped to other ports below 512: those between 512 and 1023 inclusive 19 will be mapped to ports below 1024, and other ports will be mapped to 20 1024 or above. Where possible, no port alteration will occur. 21 22 In Kernels up to 2.6.10, you can add several \-\-to\-source options. For those 23 kernels, if you specify more than one source address, either via an address 24 range or multiple \-\-to\-source options, a simple round-robin (one after another 25 in cycle) takes place between these addresses. 26 Later Kernels (>= 2.6.11-rc1) don't have the ability to NAT to multiple ranges 27 anymore. 28 .TP 29 \fB\-\-random\fP 30 If option 31 \fB\-\-random\fP 32 is used then port mapping will be randomized (kernel >= 2.6.21). 33 .TP 34 \fB\-\-persistent\fP 35 Gives a client the same source-/destination-address for each connection. 36 This supersedes the SAME target. Support for persistent mappings is available 37 from 2.6.29-rc2. 38
