Hi all,
I am new in using iptables so I would like to do a few questions for something that maybe many of you find easy :)
In particular, I have a laptop with two wireless interfaces, a Wifi and a 3G. I would like to share the 3G broadband connection available on this laptop with other machines within my home/internal network through the wifi interface. I would like to ask if such functionality is possible to be implemented using iptables.
Even more specific what I need is a 'relay'-like functionality. Let's assume that laptop A has the two interfaces and laptop B has only a wifi interface. Laptop-B will be connected with laptop A through the wifi and laptop A needs to serve all the internet requests of laptop B through the 3G usb modem interface.
I think that I need to use rules like the following for laptop A :
(I use the names wifi0 and 3g0 for the corresponding interfaces and xxx.yyy.zzz.www for the ip of the 3G interface)
iptables -A FORWARD -i wifi0 -o 3g0 -j ACCEPT
iptables -A FORWARD -i 3g0 -o wifi0 -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -A POSTROUTING -t nat -s 192.168.0.0/24 -o eth0 -j SNAT --to-source xxx.yyy.zzz.www
Do I miss something here ? Do I need to take care of something else as well?
Thanks a lot for the help
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