I have a little hope generated here.
With the following rule:

rdr on $ext_if inet proto tcp from any to ($ext_if) port 8080 -> 127.0.0.1 port 21

When I ftp as follows:

# ftp -P 8080 198.144.201.133

I get a proper login and an "FTP>" prompt.  If I enter any commands I get hung.


 

I agree that ftp is somewhat complicated so I changed strategy.   I'm just trying to get pf working and able to forward 
and do NAT translations.   Instead I'm trying to map port 80 (HTTP) to the NFS device.   Before we get into it again, 
the NFS device has a small webserver on it to allow administration.   Below I show two files, a script I run and the 
rules file.   Below that is the result of running the script which all looks good.  I tested the NFS webserver from my 
host going directly to http://192.168.1.2 and it works just fine.   But after running the script and accessing http://
198.144.201.133 from another machine on the network, I get no response.   I can't make the rules file any simpler and I 
can't think of anything else to get it going.   

go2: - script
slay io-pkt-v4-hc
sleep 2
io-pkt-v4-hc -ptcpip forward –dspeedo sleep 2
ifconfig fxp0 inet 198.144.201.133 netmask 255.255.255.112
ifconfig fxp1 inet 192.168.1.1 netmask 255.255.255.0
mount -Ttcpip lsm-pf-v4.so
sleep 1
pfctl -f /etc/pf2.conf
pfctl -e
echo "Rules in Effect"
pfctl -s nat

/etc/pf2.conf:
rdr on fxp0 proto TCP from any to 198.144.201.133 port 80 -> 192.168.1.2 port 80

# sh -v go2
# sh -v go2
slay io-pkt-v4-hc
sleep 2
io-pkt-v4-hc -ptcpip forward -dspeedo
sleep 2
ifconfig fxp0 inet 198.144.201.133 netmask 255.255.255.112
ifconfig fxp1 inet 192.168.1.1 netmask 255.255.255.0
mount -Ttcpip lsm-pf-v4.so
sleep 1
pfctl -f /etc/pf2.conf
No ALTQ support in kernel
ALTQ related functions disabled
pfctl -e
No ALTQ support in kernel
ALTQ related functions disabled
pf enabled
echo "Rules in Effect"
Rules in Effect
pfctl -s nat
No ALTQ support in kernel
ALTQ related functions disabled
rdr on fxp0 inet proto tcp from any to 198.144.201.133 port = http -> 92.168.1.2 port 80

Mitchell,

Can you post your solution for getting the packet forwarding resolved? I am trying a similar thing using pf to redirect 
a port to another machine. My redirect logic is working fine. I tested by redirecting a high port (4000) to  localhost 
port 21 and verifying I could telnet to the box on port 4000.

rdr pass on @int_if inet proto tcp from any to any port 4000 -? 127.0.0.1 port 21

The problem I am running into is getting PF to forward my packet. I have tried to put a line in /etc/sysctl.conf
net.inet.ip.forwarding=1

But, like you, that does not work.

When I enter the forward option through io-pkt-v4 (below) all of my interfaces disappear when I do an "ifconfig -a".

# io-pkt-v4-hc -ptcpip forward

Can someone please explain how to turn packet forwarding on correctly with QNX 6.5 and have it persist on reboot? Thanks
!