Router type: optional, describes the router/NAT model you have, mainly in a home installation. This information could be useful for us to correlate weird probe behavior across similar router models.
Allowed bandwidth: it's not used yet, but you can imagine the future purpose for it 😃
DNS options: this has been asked by some of you before. By default it's off. If you set it to "simple" then your probe will have a probe-xxxx.probes.atlas.ripe.net DNS entry. If you set it to "obfuscated" then your probe will have a .probes.atlas.ripe.net DNS entry. We'll activate this feature soon.
Public: you can make your probe visible to everyone, which means that all Atlas users will see the probe in their probe list (with role "Viewer"), and they will be able to see the measurement details on the probe status page. Consider this an experimental feature -- we have to see if it's useful or not.