Welcome to LQ!!!
When you say SuSE I am assuming it is openSuSE and not SuSE Linux Enterprise Server. The document you mentioned is for openSuSE and will work well with SuSE as well as with openSuSE with just one exception that SuSE require you to purchase subscription.
Coming to troubleshooting part, did you check if you are able to ping the default gateway? What about resolution? Are you able to resolve any of the websites? Is it just zipper or yast have issues or internet access itself is affected?
You said you are using USB2LAN, how it is configured. Is your Ubuntu box and SuSE box are able to communicate with each other? How you have setup the network?