libxt_NETMAP.man

This target allows you to statically map a whole network of addresses onto
another network of addresses.  It can only be used from rules in the
.B nat
table.
.TP
\fB\-\-to\fP \fIaddress\fP[\fB/\fP\fImask\fP]
Network address to map to.  The resulting address will be constructed in the
following way: All 'one' bits in the mask are filled in from the new `address'.
All bits that are zero in the mask are filled in from the original address.
.TP
IPv6 support available since Linux kernels >= 3.7.