Linux/iptables

filter	INPUT OUTPUT FORWARD
nat	PREROUTING OUTPUT POSTROUTING
mangle	PREROUTING POSTROUTING OUTPUT INPUT FORWARD
raw	PREROUTING OUTPUT
security

Tables

• Filter (Default)
• NAT
• Mangle (modify ip headers)
• (Raw) (Connection tracking)
• (Security) (SELinux Tagging)

raspi wifi to ethernet

• rc.local
  • iptables --table nat --append POSTROUTING --out-interface wlan0 -j MASQUERADE
  • iptables --append FORWARD --in-interface eth0 -j ACCEPT