#4 NAT, choice between SNAT or DNAT

[Anonymous]

When I create a NAT entry, turtle creates both a DNAT
and a SNAT entry. Usually you want either SNAT or DNAT.
When you use DNAT (most common) the destination address
is changed on the way in, and the source address is
changed on the way back. So there's no need for an
additional SNAT rule.