Linksys WRT1900AC, Routing all traffic through the tunnel via the client

[Mainer_207]

I currently have the WRT1900AC running OpenVPN server. I am using the default firmware from Linksys. The Linksys firmware does NOT allow me to restrict the traffic routing through the VPN tunnel. I have to perform this function on the client side. I have seen responses by others alluding to adding a line to the client config file regarding "redirect". Can someone explain exactly what this command does and what the df1 flag is doing?

EDIT 1: Also, what effect would using the "block-local" flag have?