ipnat.conf is the configuration file, on NetBSD in /etc .
######  IPNAT.CONF ######
## Mind that fxp0 is our internet connection
## 10.0.2.0 and 10.0.1.0 are our internal networks
## NAT first
## nat ftp to the built in ftp-proxy 
map fxp0 10.0.2.0/24 -> 0/32 proxy port 21 ftp/tcp
map fxp0 0.0.0.0/0 -> 0/32 proxy port 21 ftp/tcp
##nat net 1 to the internet
map fxp0 10.0.2.0/24 -> 0.0.0.0/32
##nat net 2 to the internet
map fxp0 10.0.1.0/24 -> 0.0.0.0/32
## REDIRECTS next 
## redirects with the same or different ports and networks
rdr fxp0 0/0 port 443 -> 10.0.1.9 port 443 
rdr fxp0 0/0 port 7775 -> 10.0.1.7 port 3389 
rdr fxp0 0/0 port 7384 -> 10.0.2.121 port 3389
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