@0 scrub in all fragment reassemble 
nat on lo0 inet from 192.168.1.1 to any -> 10.0.0.1
rdr on lo0 inet proto tcp from any to 1.2.3.4 port 2222 -> 10.0.0.10 port 22
binat on lo0 inet from 192.168.1.1 to any -> 10.0.0.1
@0 pass in on lo1 all