1This is an experimental demonstration target which inverts the source
2and destination fields in the IP header and retransmits the packet.
3It is only valid in the
4.BR INPUT ,
5.B FORWARD
6and
7.B PREROUTING
8chains, and user-defined chains which are only called from those
9chains.  Note that the outgoing packets are
10.B NOT
11seen by any packet filtering chains, connection tracking or NAT, to
12avoid loops and other problems.
13