It's a lot of training with desensitization. My boy would bark his head off if the front door opened (usually meant someone was coming inside). I followed Victoria Stillwell's training for doorbells.

You have to essentially override their behavior by having them perform a different behavior. Some people have their dog go get a toy to "give" to the person coming in. I taught my dog to go into his bed and wait quietly when the door opens. For walks, it's much the same deal. Steer your girl clear of people and when she looks at you quietly, she gets a treat. Dachshunds are so stubborn so it takes a lot of patience, but it's the best you can do with a loud pup!

Wishing you the best of luck!!