Is an OPT interface subnet allowed to be same as a private address in WAN ?

[holmsn]

Maybe not a good idea long term, but while testing my pfsense behind another router and using one of this routers 192.168.0.x address space as WAN input ,wondered whether inter-vlan routing would work if these 192.168.0.x addresses were "re-used" on one of the OPT interfaces of the LAN ( itself the default 192.168.1.x) ?

[cmb]

Routing can't work when you do that (with any router/firewall).

[holmsn]

OK, thanks for that, will just have to change a few static ip assignments when I go "live" on the pfsense using PPPOE to WAN and bypassing the old router