You must get more specified, and find where the problem lies. First: can you connect to the computers own networkdevice ? Of course it is not easy to know your own IP-adress, if you use "dynamic" IP.
Go into yast --> networkdevices -->Networkcards and configur it. Give it a STATIC IPaddress, and acertain that your router etc are right.
When ready ping your own IP-adress . If successful ping your routers IP address . If successful ping your ISP. When I say ping I mean "ping -c4" ( or the computer will ping forever) (you could also install "fping" which pings whole networks)
If lucky, these simple measures could solve it. Anyway, with the results, somebody might be able to give practical advice. Personally I would put my bet on some firewall-problems, or that something is forgotten in the network configuration. ( When the computer confirms that the adaptor works, it only means that it can move data between the outside and the inside of the case.)
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