I may have covered some of this in a previous post so apologies.

Slightly different setup than previous but here is the layout :

Draytek 2830 + AP-800

All working fine on internet and internal network.

what I am trying to do is create a guest wifi network for when guests and visitors want to use the internet. I have created a VLAN on the 2830 and tagged it with VLAN ID 20.
I have then on the AP-800 created a 2nd SSID called guest and given it the VLAN tag of 20.
I have setup LAN2 on the 2830 to give out IP addresses to the VLAN.

I can connect to the SSID of the guest network but never get an IP address.

Any ideas what I am doing wrong?

Incidentally, I have this working fine on another site with a 2830n but in this case the non-wireless 2830 does not seem to work.

thaks

Rob

All long has you have the correct VLANs tick on the 2830 and disabled the 2nd Subnet feature on the AP800 then it should work.

yes all that is correct.

Just had a thought though, do I need to have an 802.1Q aware switch?

yes that's helps!

you would need to tag the port the AP plus into in VLAN20 and also tag the port that links to the router

I don't need to tag anything on the switch. The switch just needs to understand the packet so it can forward it.

I have a similar setup at another office which works perfectly and the switch is a Netgear Prosafe which is in it's default setting and I had to do nothing to it but the VLAN tag works through it.

I will change the switch for this one and see what happens.

they do but its not good practice and defeats the whole point of a VLAN.
you need to create the separate broadcast domain so the frames are forward efficiently. your switch wont be getting hammered by the unnecessary broadcast either.
Even ifs its a smart switch you should still be able to use a VLAN with the Prosafe plus utility.