YaST's DSL stuff is (presumably) for a DSL modem connected to the wired port.
If you have a DSL router which is also a wireless access point then I would expect you
to talk to the router via a "web" interface.
(e.g. I configure my Belkin AP via
where 192.168.0.42 is IP address DHCP assigned to the AP.
My old 3Com ISDN router was same sort of idea.
Perhaps if you explained how your network(s) are arranged I/we could guess better.