Packet Flow

Forwarding(from one network interface to another) #

1. mangle:PREROUTING
2. nat:PREROUTING
3. mangle:FORWARD
4. filter:FORWARD
5. mangle:POSTROUTING
6. nat:POSTROUTING

Input(from a network interface to a local process) #

1. mangle:PREROUTING
2. nat:PREROUTING
3. mangle:INPUT
4. filter:INPUT

Output(from a local process to a network interface) #

1. mangle:OUTPUT
2. nat:OUTPUT
3. filter:OUTPUT
4. mangle:POSTROUTING
5. nat:POSTROUTING

Local(from a local process to another local process) #

1. mangle:OUTPUT
2. nat:OUTPUT
3. filter:OUTPUT
4. filter:INPUT
5. mangle:INPUT