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authorPatrick McHardy <kaber@trash.net>2007-05-29 11:24:45 +0000
committerPatrick McHardy <kaber@trash.net>2007-05-29 11:24:45 +0000
commitef399a3033aa860ea1653b9c4306c0e78777e981 (patch)
treecc732fc4d5c139f113444a72e4eef88e2a8367ef /extensions/libipt_SNAT.man
parent46d9afb160bfd330452442d28318809079a7f84f (diff)
Add --random option to DNAT and REDIRECT targets and fix the manpage mess this option left behind.
Diffstat (limited to 'extensions/libipt_SNAT.man')
-rw-r--r--extensions/libipt_SNAT.man17
1 files changed, 10 insertions, 7 deletions
diff --git a/extensions/libipt_SNAT.man b/extensions/libipt_SNAT.man
index daef78f1..7b34799a 100644
--- a/extensions/libipt_SNAT.man
+++ b/extensions/libipt_SNAT.man
@@ -7,7 +7,7 @@ modified (and all future packets in this connection will also be
mangled), and rules should cease being examined. It takes one type
of option:
.TP
-.BR "--to-source " "\fIipaddr\fP[-\fIipaddr\fP][:\fIport\fP-\fIport\fP]" [ "--random" ]
+.BR "--to-source " "\fIipaddr\fP[-\fIipaddr\fP][:\fIport\fP-\fIport\fP]"
which can specify a single new source IP address, an inclusive range
of IP addresses, and optionally, a port range (which is only valid if
the rule also specifies
@@ -17,15 +17,18 @@ or
If no port range is specified, then source ports below 512 will be
mapped to other ports below 512: those between 512 and 1023 inclusive
will be mapped to ports below 1024, and other ports will be mapped to
-1024 or above. Where possible, no port alteration will If option
-.B "--random"
-is used then port mapping will be forcely randomized to avoid
-attacks based on port prediction (kernel >= 2.6.21).
-.RS
-.PP
+1024 or above. Where possible, no port alteration will
+
In Kernels up to 2.6.10, you can add several --to-source options. For those
kernels, if you specify more than one source address, either via an address
range or multiple --to-source options, a simple round-robin (one after another
in cycle) takes place between these addresses.
Later Kernels (>= 2.6.11-rc1) don't have the ability to NAT to multiple ranges
anymore.
+.TP
+.BR "--random"
+If option
+.B "--random"
+is used then port mapping will be randomized (kernel >= 2.6.21).
+.RS
+.PP