Cascaded Router Setup

[ThisTNTSquid]

I have a firewall running with pfsense, and i want the firewall to protect the wireless router (asus one) and other things connect ed to the firewall.

But the problem comes, how should i wire up the 2 things together and what is needed to be configured in the firewall and asus router?

[johnpoz]

So your asus wifi router is in front of pfsense, or behind it?  There should be no devices connected to your asus router if that is your internet connection and you want to now use pfsense.  Pfsense can use a double nat, but things have to be behind it to be "protected"  If going to use the asus behind pfsense for your wifi, then you would jsut use it as an access point not a router.