====== EdgeRouter Firewall ======

(blue = new, green = established, white = related, red = invalid)

{{:admin:network:edgerouter:edgerouter-all-firewall-rules.png?nolink|}}

<code edgerouter>
firewall {
    name DMZ_IN {
        default-action drop
        description "incoming on DMZ"
        rule 1 {
            action accept
            description "DMZ valid established"
            state {
                established enable
                related enable
            }
        }
        rule 2 {
            action accept
            description "DMZ new to WAN"
            destination {
                group {
                    address-group ADDRv4_eth1
                }
            }
            state {
                new enable
            }
        }
        rule 3 {
            action drop
            description "DMZ invalid"
            state {
                invalid enable
            }
        }
    }
    name DMZ_LOCAL {
        default-action drop
        description "DMZ to router"
    }
    name LAN_IN {
        default-action drop
        description "incoming on LAN"
        rule 1 {
            action accept
            description "LAN all valid"
            state {
                established enable
                new enable
                related enable
            }
        }
        rule 2 {
            action drop
            description "LAN invalid"
            state {
                invalid enable
            }
        }
    }
    name LAN_OUT {
        default-action drop
        description "LAN outcoming"
        rule 1 {
            action accept
            description "LAN valid existing"
            state {
                established enable
                related enable
            }
        }
        rule 2 {
            action drop
            description "LAN new & invalid"
            state {
                invalid enable
                new enable
            }
        }
    }
    name WAN_IN {
        default-action drop
        description "incoming on WAN"
        rule 1 {
            action accept
            description "WAN valid established"
            state {
                established enable
                related enable
            }
        }

        /* Rules allowing WAN -> DMZ connections go here. */

        rule 2 {
            action drop
            description "WAN new & invalid"
            state {
                invalid enable
                new enable
            }
        }
    }
    name WAN_LOCAL {
        default-action drop
        description "WAN to router"
    }
}
interfaces {
    ethernet eth0 {
        description LAN
        firewall {
            in {
                name LAN_IN
            }
            out {
                name LAN_OUT
            }
        }
    }
    ethernet eth1 {
        description WAN
        firewall {
            in {
                name WAN_IN
            }
            local {
                name WAN_LOCAL
            }
        }
    }
    ethernet eth2
    ethernet eth3
    ethernet eth4
    switch switch0 {
        description DMZ
        firewall {
            in {
                name DMZ_IN
            }
            local {
                name DMZ_LOCAL
            }
        }
        switch-port {
            interface eth2
            interface eth3
            interface eth4
        }
    }
}
</code>

taken from: https://github.com/didenko/er_poe_fw#all-together