In this article on setting up a guest network:
at the end of section 3 it suggests "Also enable masquerading for lan"
When I previously set up a guest network, I followed a similar but older guide, which appears to be the one here:
This does not suggest to enable masquerading for lan.
Can someone explain to me (a) what this actually does and (b) why it is recommended in the newer guide? As I understand it a NAT router does masquerading by default - i.e. the outside world sees the router's IP address, not my PCs (which are all 192.168.1.x addresses). So what difference does this tick box make? Everything seems to work as I expect with or without it ticked.