Someone

WAN_IF = "fxp0"
LAN_IF = "rl0"

WIP_MYIP = "192.168.0.155"
LIP_MYIP = "10.0.0.155"

WIP_IBM = "192.168.0.50"
LIP_IBM = "10.0.0.50"

scrub in all

rdr pass on $WAN_IF proto tcp from any to $WIP_IBM port 80 -> $LIP_IBM port 80
nat on $WAN_IF from $LIP_IBM to any -> $WIP_IBM

block in all 
pass out all

pass in on $WAN_IF proto tcp from any to $WIP_MYIP port 22 flags S/SA keep state

pass in log on $WAN_IF proto tcp from any to $LIP_IBM port 80 flags S/SA keep state