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Im using a 3G USB huawei modem to get access to the internet, therefore, i have an active ppp interface addressed. I want to share this access with my wlan interface so that every device that will get connected to my wifi hotspot will get access to the internet too. How can i do that? Thanks

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In ubuntu 14 or ubuntu 15, you can use this command : - first, you activate routing :

sudo echo 1 > /proc/sys/net/ipv4/ip_forward

- second, you write a dynamic translation rule source IP address.

sudo iptables -A POSTROUTING -t nat -s address/mask -o internet_interface -j MASQUERADE

where adress/mask is a address range who don't have the internet access, and then internet_interface is the interface who have the internet access. Example of this rule :

sudo iptables -A POSTROUTING -t nat -s 192.168.7.0/24 -o ppp0 -j MASQUERADE

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