I thought I was knowledgeable enough about wireless networks but what you just said didn't really mean much to me past what an SSID is
Sorry, mate, I only just saw your post.
Having multiple SSIDs means that you can run 2 (or more) SSIDs concurrently from your Access Point/wireless router. For example, you might have configured one SSID called Fillado1 that is tightly configured how you want it to be, e.g. it uses WPA2 PSK, specific MAC filters applied, certain DHCP scopes in place, the SSID broadcast is disabled, etc... You also have another SSID running called Fillado2 which is configured differently, e.g. only using WEP, has different MAC filtering which includes your DS, has no DHCP enabled, the SSID is broadcast, etc...
This means that your DS can see and connect to Fillado2 whilst you can configure your other devices to connect to Fillado1.
You then configure VLANS, or Virtual LANs, on the router so that, for example, any device connected to Fillado1 can see other devices on the same VLAN and can also go out to the internet. However anything that connects to Fillado2 (which should only be your DS unless someone is using your connection without authorisation) can only go out to the internet and can not see any devices connected to the Fillado1 VLAN.
So, as you can see, it stops someone who has connected to your network using the insecure encryption applied to Fillado2's SSID from being able to access your kit that's connected to Fillado1's SSID.
Hope that helps
