title: Sharepoint External Content Type authentication mode - what to choose?
body: <p>My scenario is simple: i have a list of employees in some database, I would like to display it in sharepoint for everyone to see (read only, no updates).
  So I created SQL external content type and then created external list based on it. But I can't get how to handle the autnetication. On creating the external content type you get to choose authentication mode: user's identity, windows impersonated and custom impersonated. I don't want my sharepoint (AD) users to have access to the database so the first option is out. I just want everyone to see the list in sharepoint and I have an sql user and password to get there, but i don't know how to provide it. I've read a lot about the authentication modes but I still don't understand it.</p>