Take the 2-minute tour ×
Server Fault is a question and answer site for professional system and network administrators. It's 100% free, no registration required.

I need to forward all connection to any address port 22 to a different gateway (i.e. no default). Firstly I suppose to do it with ipfw:

sudo ipfw add 5 fwd $EXTERNAL_IP,22 tcp from any to any 22 keep-state

But with Mac OS X Lion it seems do not work. Anyway, looking at ipfw documentation I see it is deprecated and I should use pfctl.

So I have modified /etc/pf.conf file:

rdr proto tcp from $internal_ip to any port 22 -> $external_ip port 22

But with no luck.

Does anyone know how to translate or forward all connections generated by local applications to any address but port 22 to a different gateway/ip address?

Update

Following Jake's suggestion I tried to specify only destination IP, so I converted rdr rule to mac os x syntax:

rdr proto tcp from any to any port 22 -> $external_ip port 22

Even in this case I didn't get results I expected, i.e. I can connect via ssh to my server but through default gateway.

share|improve this question
    
Did you figure it out? I'm trying myself to insert a transparent proxy on localhost between localhost and external services and with no luck. My guess is that OS X just joined Windows on this front - no more NAT support at system firewall level, but I still hope it can be done. –  foxx1337 Aug 15 '12 at 22:31
2  
No, I have abandoned and switched on linux. –  freedev Aug 22 '12 at 8:20
    
exactly what i did, in fact; thanks for the update –  foxx1337 Aug 22 '12 at 12:02
add comment

closed as off-topic by MDMarra, Falcon Momot, mdpc, dawud, Dave M Sep 15 '13 at 17:26

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "Questions must be relevant to professional system administration. Server Fault is a site dedicated to professionals; novice questions are off-topic. Please see the Help Center for more information on topicality. The best advice we can give you is to hire a professional to help you out." – MDMarra, Falcon Momot, mdpc, dawud, Dave M
If this question can be reworded to fit the rules in the help center, please edit the question.

2 Answers

rdr pass on $internal_ip inet proto tcp from any to any port 22

Not an expert by any means, think that should do it. Been a long time since I used anything other than iptables :)

share|improve this answer
    
Thanks Jake for your tentative to help, unfortunately this syntax is not supported and even trying to correct the rdr rule didn't give the expected result. I have updated my question with your suggestion. –  freedev Jan 10 '12 at 0:12
add comment

You can try to find a port of rinetd for Mac OS X.

share|improve this answer
add comment

Not the answer you're looking for? Browse other questions tagged or ask your own question.