iptables Equivalent for Mac OS X – What to Use

ipfwiptablesmac-osx

I want to forward requests from 192.168.99.100:80 to 127.0.0.1:8000. This is how I'd do it in linux using iptables:

iptables -t nat -A OUTPUT -p tcp --dport 80 -d 192.168.99.100 -j DNAT --to-destination 127.0.0.1:8000

How do I do the same thing in MacOS X? I tried out a combination of ipfw commands without much success:

ipfw add fwd 127.0.0.1,8000 tcp from any to 192.168.99.100 80

(Success for me is pointing a browser at http://192.168.99.100 and getting a response back from a development server that I have running on localhost:8000)

Best Answer

So I found out a way to do this. I'm not sure if it's the preferred way but it works! At your favourite shell:

sudo ifconfig lo0 10.0.0.1 alias
sudo ipfw add fwd 127.0.0.1,9090 tcp from me to 10.0.0.1 dst-port 80

(The alias to lo0 seems to be the missing part)

If you'd like a (fake) domain to point to this new alias then make sure /etc/hosts contains the line:

10.0.0.1 www.your-domain.com
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