Dual WAN configuration and firewall

[Denna]

Scenario: The router's WAN and USB (Android connection) ports are configured in a load balanced (dual WAN) configuration.

Does that mean you should protect the USB0 interface with iptables like you would VLAN2 (WAN port on an RT-AC88U) ?

For example:

iptables -I INPUT -i VLAN2 -m state --state NEW -j DROP

iptables -I INPUT -i USB0 -m state --state NEW -j DROP​

 

[Denna]

For those just learning to write firewall rules, removing the "-i" option will allow the rule to match on all interfaces.