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51 lines
1.9 KiB
51 lines
1.9 KiB
This target is only valid in the
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.B nat
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table, in the
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.B POSTROUTING
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and
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.B INPUT
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chains, and user-defined chains which are only called from those
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chains. It specifies that the source address of the packet should be
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modified (and all future packets in this connection will also be
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mangled), and rules should cease being examined. It takes the
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following options:
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.TP
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\fB\-\-to\-source\fP [\fIipaddr\fP[\fB\-\fP\fIipaddr\fP]][\fB:\fP\fIport\fP[\fB\-\fP\fIport\fP]]
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which can specify a single new source IP address, an inclusive range
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of IP addresses. Optionally a port range,
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if the rule also specifies one of the following protocols:
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\fBtcp\fP, \fBudp\fP, \fBdccp\fP or \fBsctp\fP.
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If no port range is specified, then source ports below 512 will be
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mapped to other ports below 512: those between 512 and 1023 inclusive
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will be mapped to ports below 1024, and other ports will be mapped to
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1024 or above. Where possible, no port alteration will occur.
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In Kernels up to 2.6.10, you can add several \-\-to\-source options. For those
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kernels, if you specify more than one source address, either via an address
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range or multiple \-\-to\-source options, a simple round-robin (one after another
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in cycle) takes place between these addresses.
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Later Kernels (>= 2.6.11-rc1) don't have the ability to NAT to multiple ranges
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anymore.
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.TP
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\fB\-\-random\fP
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If option
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\fB\-\-random\fP
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is used then port mapping will be randomized through a hash-based algorithm (kernel >= 2.6.21).
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.TP
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\fB\-\-random-fully\fP
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If option
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\fB\-\-random-fully\fP
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is used then port mapping will be fully randomized through a PRNG (kernel >= 3.14).
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.TP
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\fB\-\-persistent\fP
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Gives a client the same source-/destination-address for each connection.
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This supersedes the SAME target. Support for persistent mappings is available
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from 2.6.29-rc2.
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.PP
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Kernels prior to 2.6.36-rc1 don't have the ability to
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.B SNAT
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in the
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.B INPUT
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chain.
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.TP
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IPv6 support available since Linux kernels >= 3.7.
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