Is it possible to set what WAN IP an SSID uses? I can set 1:1 or 1:Many NAT on devices coming IN to a specific IP address and tell them where to go, but I want to have a VLAN that uses a specific WAN IP for OUTGOING traffic. I need a network my IT Developers can jump on to test our sites as an external user, and avoid the Firewall too.
Yup, you'd need to build a whole separate Internet uplink. Create the SSID (eg. ITDev), use VLAN trunking to put it on its own VLAN, with its own default gateway and DHCP server - could be a separate MX unit, or just a regular router. Your SSID would need to be in bridged mode so the router/MX can assign a different subnet and different default gateway to devices on the ITDev SSID.