WAX206 in AP mode with 2 SSIDs

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Islandvolker wrote:

I've created to subnets on the router with subnet masks 192.168.100.x and 192.168.200.x.

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A soft-subnetting on the same network won't help us much.

On one hand, the different IP subnet addresses won't add a lot of segregation, on the other hand there are "modern" features like IGMP Multicast or in general less sophisticated multicast e.g. as used by discovery mechanisms like apple's Airplay, Bonjour,  uPnP and the likes still play on the very same L2 network, and don't care much about L3 addressing. Still a piece of cake to discover the other devices and services (like these provided by your NAS). 

As you are a happy Draytek router owner, your subnets are (or should) segregated by VLANs. With anything else, you won't win a horse for what you intend to achieve. I have no idea, what made Netgear to stick on these multi-SSID ideas for far to long. Oh even major router vendors have up these secondary IP subnet design decades ago Ye, what you have configured the hard way must be considered history, .... oh sorry say'n.

Can't add more than for what you want to achieve with multiple SSIDs (logically each representing a different network - often abused by the WiFi industry to distinguish different "network" bands for decades. Yes, multiple SSIDs connecting to the same network does not make an awful lot of sense. The only exception is that some credentials don't have to be shared.

A wireless SSID does designate a network. And wireless access points - pure L2 devices, so no routers, not iPv4 aware for example - are L2 bridges. Not routers. some years ago i had to shout at some Netgear product managers - a long time ago they launched a new access point series. the first thing I had seen during an early product access period is that these access points were by default routers, had to browse some hundred pages of user manual on routing, before the reader found information on the access point, how to disable the routing features, ...