CIDR and Accidental Asymmetric Routing

[moikerz]

Just looking for some clarification on configuring WAN, NAT details. I have a WAN with a /29 block. My ISP's Gateway is xxx.xxx.xxx.65. I have pfSense's Interface>WAN set as xxx.xxx.xxx.66/29. Is this correct, or should it be .66/30?

I'm also wondering if my outbound NAT is using .66 exclusively, or if it is using the entire /29 range.

Under Firewall>Virtual IPs, I have nothing configured.

Under Firewall>NAT>Outbound, I am using Automatic Outbound.

Advise appreciated. Happy New Year!