extensions: libxt_MASQUERADE: rename IPv4 manpage and tell about IPv6 support

also update list of protocols valid for port mapping.

Signed-off-by: Mart Frauenlob <mart.frauenlob@chello.at>
Signed-off-by: Florian Westphal <fw@strlen.de>

1 files changed, 28 insertions, 0 deletions

diff --git a/extensions/libxt_MASQUERADE.man b/extensions/libxt_MASQUERADE.man
new file mode 100644
index 00000000..c9e39501
--- /dev/null
+++ b/extensions/libxt_MASQUERADE.man
@@ -0,0 +1,28 @@
+This target is only valid in the
+.B nat
+table, in the
+.B POSTROUTING
+chain.  It should only be used with dynamically assigned IP (dialup)
+connections: if you have a static IP address, you should use the SNAT
+target.  Masquerading is equivalent to specifying a mapping to the IP
+address of the interface the packet is going out, but also has the
+effect that connections are
+.I forgotten
+when the interface goes down.  This is the correct behavior when the
+next dialup is unlikely to have the same interface address (and hence
+any established connections are lost anyway).
+.TP
+\fB\-\-to\-ports\fP \fIport\fP[\fB\-\fP\fIport\fP]
+This specifies a range of source ports to use, overriding the default
+.B SNAT
+source port-selection heuristics (see above).  This is only valid
+if the rule also specifies one of the following protocols:
+\fBtcp\fP, \fBudp\fP, \fBdccp\fP or \fBsctp\fP.
+.TP
+\fB\-\-random\fP
+Randomize source port mapping
+If option
+\fB\-\-random\fP
+is used then port mapping will be randomized (kernel >= 2.6.21).
+.TP
+IPv6 support available since Linux kernels >= 3.7.