IP Forwarding and iptables configuration

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Forwarding must be enabled
root@raspbx:~# cat /proc/sys/net/ipv4/ip_forward
0
root@raspbx:~# sysctl -w net.ipv4.ip_forward=1
net.ipv4.ip_forward = 1
root@raspbx:~# cat /proc/sys/net/ipv4/ip_forward
1
root@raspbx:~#
Routing and Masquerading

iptables --table nat --append POSTROUTING -o ppp0 -j MASQUERADE

iptables --append FORWARD -i eth0  -j ACCEPT
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