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the below command create a alias for share your internet connection with another.
ifconfig eth0:1 192.168.0.1/24
Its obviously necessary too activate the iptables post-routing and ip forwarding, as root:
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
echo 1 > /proc/sys/net/ipv4/ip_forward
Be sure that the alias 192.168.0.0/24 is not your active real ip range
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