This feature request enables network address translation between IPv4 and IPv6 and vice versa.
Here is a pseudo code of how a typical usage might be:
set nat relay rule 1 source address 0.0.0.0 set nat relay rule 1 source port 123 set nat relay rule 1 translation address 2001:DB8::1 set nat relay rule 1 translation protocol udp set nat relay rule 1 translation port 6123
Here is a typical implementation using socat
socat UDP4-LISTEN:123,fork,su=nobody UDP6:[2001:DB8::1]:6123