best is to make a drawing... from my understanding you want to get dhcp for vlan 1 from the DSL router? make a capture on the port connected to AP and dsl router. look if you see bootp message from client and dhcp server. your client should send discover. your dsl router should send offer. guest ssid is configured for "bridge mode" and "dont use vlan tagging"? if you dsl router is not trunking you could just set the switchport to access with vlan 1
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